{
  "snapshot": "2026-09-27T06:45:36.079Z",
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    "population": "All active original eng-test.com questions, ordered by id; no official ETS exam items or learner responses.",
    "difficulty": "Editorial labels, not observed error rates. Topic groups overlap.",
    "skills": "Case-insensitive regex on tested_skill_en. Word boundary excludes correlative from relative; agreement restricted to subject-verb labels.",
    "contexts": "Exact pipe/comma-separated tags. Selected business contexts only; overlapping, not an exhaustive ranking.",
    "pairs": "Correct answer versus each distinct incorrect option within one question; trim/lowercase; ASCII alphabetic single words only; unordered pair keys; no stemming. Counts are pair events, not learner mistakes."
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          "Grammar: relative pronoun (whom)",
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        [
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        [
          "Grammar: relative pronouns (location)",
          1
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          "Grammar: relative pronouns (non-human subject)",
          1
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        [
          "Grammar: relative pronouns (of which)",
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        [
          "Grammar: relative pronouns (referring to a clause)",
          1
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          "Grammar: relative pronouns (restrictive clause)",
          1
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        [
          "Grammar: relative pronouns (subject vs. object)",
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        [
          "Grammar: relative pronouns (who/whom)",
          1
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        [
          "Grammar: relative pronouns and quantifiers",
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        [
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          1
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          1
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          "Incomplete sentences: relative pronoun (that)",
          1
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        "medium": 71,
        "hard": 204
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          4
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          1
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          "Grammar: inverted conditionals (Type 3)",
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          "Grammar: subject-verb agreement in conditional clauses",
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          "Grammar: third conditional (inverted with 'had')",
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        "medium": 601,
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          "wear",
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          7
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          7
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        [
          "Grammar: infinitive of purpose",
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        [
          "Grammar: infinitive after 'to'",
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          "Grammar: infinitives of purpose",
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          28
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          25
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          14
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          10
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          10
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          9
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          8
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          7
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          4
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          "Grammar: gerunds after verbs",
          4
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        [
          "Grammar: Infinitive",
          4
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          4
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        [
          "Grammar: infinitive after 'designed to'",
          4
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        [
          "Grammar: infinitive after 'managed to'",
          4
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          4
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          4
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          3
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        [
          "Grammar: infinitive after 'decided to'",
          3
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        [
          "Grammar: infinitive after 'need to'",
          3
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        [
          "Grammar: infinitive after 'required to'",
          3
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        [
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          3
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          "Grammar: infinitive verb forms",
          3
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        [
          "Grammar: passive voice with infinitive",
          3
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        [
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          3
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        [
          "Grammar: verb forms after infinitive",
          3
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          "Grammar: gerunds after certain verbs",
          2
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          2
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          2
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          "Grammar: infinitive after 'needs to'",
          2
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          "Grammar: infinitives after 'to'",
          2
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          2
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        [
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          2
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          2
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        [
          "Grammar: verb form after infinitive",
          2
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        [
          "Grammar: verb patterns (require + object + infinitive)",
          2
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        [
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          2
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          1
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        [
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          1
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        [
          "Grammar: gerund after 'committed to'",
          1
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        [
          "Grammar: gerund after 'consider'",
          1
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        [
          "Grammar: gerund after recommend",
          1
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        [
          "Grammar: gerund after specific verbs",
          1
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        [
          "Grammar: gerund as adjective",
          1
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        [
          "Grammar: gerund as adverbial modifier",
          1
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        [
          "Grammar: gerunds after 'look forward to'",
          1
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        [
          "Grammar: gerunds after 'worth'",
          1
        ],
        [
          "Grammar: gerunds after phrasal verbs",
          1
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        [
          "Grammar: gerunds after prepositions/nouns",
          1
        ],
        [
          "Grammar: gerunds after prepositions/verbs",
          1
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        [
          "Grammar: gerunds as nouns",
          1
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        [
          "Grammar: idioms with gerunds",
          1
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        [
          "Grammar: imperative/infinitive after 'do not'",
          1
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        [
          "Grammar: infinitive / phrasal verb",
          1
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        [
          "Grammar: infinitive after 'ability to'",
          1
        ],
        [
          "Grammar: infinitive after 'ability to' and vocabulary",
          1
        ],
        [
          "Grammar: infinitive after 'ask'",
          1
        ],
        [
          "Grammar: infinitive after 'available to'",
          1
        ],
        [
          "Grammar: infinitive after 'decide to'",
          1
        ],
        [
          "Grammar: infinitive after 'decided'",
          1
        ],
        [
          "Grammar: infinitive after 'expect'",
          1
        ],
        [
          "Grammar: infinitive after 'hopes to'",
          1
        ],
        [
          "Grammar: infinitive after 'offer'",
          1
        ],
        [
          "Grammar: infinitive after 'remember to'",
          1
        ],
        [
          "Grammar: infinitive after 'remember'",
          1
        ],
        [
          "Grammar: infinitive after 'remind'",
          1
        ],
        [
          "Grammar: infinitive after 'reminded to'",
          1
        ],
        [
          "Grammar: infinitive after 'requested to'",
          1
        ],
        [
          "Grammar: infinitive after 'to remember'",
          1
        ],
        [
          "Grammar: infinitive after 'used to'",
          1
        ],
        [
          "Grammar: infinitive after 'working to'",
          1
        ],
        [
          "Grammar: infinitive after remember",
          1
        ],
        [
          "Grammar: infinitive after verb phrase",
          1
        ],
        [
          "Grammar: infinitive and collocations",
          1
        ],
        [
          "Grammar: infinitive and idioms",
          1
        ],
        [
          "Grammar: infinitive clause",
          1
        ],
        [
          "Grammar: infinitive form (phrasal verb)",
          1
        ],
        [
          "Grammar: infinitive form and vocabulary",
          1
        ],
        [
          "Grammar: infinitive of purpose with adverb",
          1
        ],
        [
          "Grammar: infinitive verb after object",
          1
        ],
        [
          "Grammar: infinitive with 'decide'",
          1
        ],
        [
          "Grammar: infinitive with 'designed to'",
          1
        ],
        [
          "Grammar: infinitive with 'encouraged to'",
          1
        ],
        [
          "Grammar: infinitive with 'expected to'",
          1
        ],
        [
          "Grammar: infinitive with 'help'",
          1
        ],
        [
          "Grammar: infinitive with 'manage'",
          1
        ],
        [
          "Grammar: infinitive with 'need to'",
          1
        ],
        [
          "Grammar: infinitive with 'need'",
          1
        ],
        [
          "Grammar: infinitive with 'strives'",
          1
        ],
        [
          "Grammar: infinitive with 'to', Vocabulary: business",
          1
        ],
        [
          "Grammar: infinitive with object",
          1
        ],
        [
          "Grammar: infinitive with phrasal verb",
          1
        ],
        [
          "Grammar: infinitive, Vocabulary: advanced business",
          1
        ],
        [
          "Grammar: infinitive, Vocabulary: business",
          1
        ],
        [
          "Grammar: infinitive, Vocabulary: business relations",
          1
        ],
        [
          "Grammar: infinitive, Vocabulary: hospitality",
          1
        ],
        [
          "Grammar: infinitive, Vocabulary: HR",
          1
        ],
        [
          "Grammar: infinitive; Vocabulary: business collocations",
          1
        ],
        [
          "Grammar: infinitives after 'aim to'",
          1
        ],
        [
          "Grammar: infinitives after 'find it'",
          1
        ],
        [
          "Grammar: infinitives after adjectives",
          1
        ],
        [
          "Grammar: infinitives after adjectives/past participles",
          1
        ],
        [
          "Grammar: infinitives after adjectives/phrases",
          1
        ],
        [
          "Grammar: infinitives after passive verbs",
          1
        ],
        [
          "Grammar: infinitives, advanced vocabulary",
          1
        ],
        [
          "Grammar: infinitives, business vocabulary",
          1
        ],
        [
          "Grammar: noun forms (gerund)",
          1
        ],
        [
          "Grammar: parallel structure (gerunds)",
          1
        ],
        [
          "Grammar: parallel structure, infinitives",
          1
        ],
        [
          "Grammar: passive gerund",
          1
        ],
        [
          "Grammar: past participle in passive infinitive",
          1
        ],
        [
          "Grammar: perfect gerund after preposition",
          1
        ],
        [
          "Grammar: perfect participle/gerund after preposition",
          1
        ],
        [
          "Grammar: preposition + gerund",
          1
        ],
        [
          "Grammar: prepositions + gerunds",
          1
        ],
        [
          "Grammar: prepositions with gerunds",
          1
        ],
        [
          "Grammar: prepositions with infinitives",
          1
        ],
        [
          "Grammar: present participle (gerund)",
          1
        ],
        [
          "Grammar: question words + infinitive",
          1
        ],
        [
          "Grammar: verb + infinitive (aims to)",
          1
        ],
        [
          "Grammar: verb + infinitive vs. gerund",
          1
        ],
        [
          "Grammar: verb + object + infinitive",
          1
        ],
        [
          "Grammar: verb + preposition + gerund",
          1
        ],
        [
          "Grammar: verb forms (gerund)",
          1
        ],
        [
          "Grammar: verb forms (infinitives)",
          1
        ],
        [
          "Grammar: verb forms after prepositions (gerunds)",
          1
        ],
        [
          "Grammar: verb pattern (decide + to-infinitive)",
          1
        ],
        [
          "Grammar: verb patterns (advise + object + infinitive)",
          1
        ],
        [
          "Grammar: verb patterns (help + infinitive)",
          1
        ],
        [
          "Grammar: verb patterns (manage to + infinitive)",
          1
        ],
        [
          "Grammar: verb patterns (managed to + infinitive)",
          1
        ],
        [
          "Grammar: verb patterns (need + gerund)",
          1
        ],
        [
          "Grammar: verb patterns (need + passive infinitive)",
          1
        ],
        [
          "Grammar: verb patterns (prevent + from + gerund)",
          1
        ],
        [
          "Grammar: verb patterns (verb + gerund)",
          1
        ],
        [
          "Grammar: verb patterns (verb + infinitive)",
          1
        ],
        [
          "Grammar: verb patterns (verb + object + infinitive)",
          1
        ],
        [
          "Grammar: verbs followed by bare infinitive",
          1
        ],
        [
          "Grammar: verbs followed by base form or infinitive",
          1
        ],
        [
          "Incomplete sentences: gerund after suggest",
          1
        ],
        [
          "Incomplete sentences: infinitive after ask",
          1
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      "questions": 283,
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      "difficulty": {
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        "hard": 14
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          "attend",
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          15
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        [
          "enhance",
          13
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        [
          "review",
          12
        ],
        [
          "register",
          9
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        [
          "track",
          9
        ],
        [
          "complete",
          8
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        [
          "must",
          6
        ],
        [
          "place",
          6
        ],
        [
          "sign",
          6
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        [
          "require",
          5
        ],
        [
          "contact",
          4
        ],
        [
          "launch",
          4
        ],
        [
          "prevent",
          4
        ],
        [
          "adjust",
          3
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        [
          "display",
          3
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        [
          "monitor",
          3
        ],
        [
          "obtain",
          3
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        [
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          3
        ],
        [
          "adapt",
          2
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        [
          "assist",
          2
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        [
          "attach",
          2
        ],
        [
          "check",
          2
        ],
        [
          "disclose",
          2
        ],
        [
          "express",
          2
        ],
        [
          "have",
          2
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        [
          "identify",
          2
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          "implement",
          2
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          38
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        [
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          29
        ],
        [
          "Grammar: verb form after modal",
          15
        ],
        [
          "Grammar: modal verb + base form",
          11
        ],
        [
          "Grammar: verb form after modal verbs",
          6
        ],
        [
          "Grammar: modal verb",
          4
        ],
        [
          "Grammar: verb forms (modals)",
          4
        ],
        [
          "Grammar: Modal verbs",
          3
        ],
        [
          "Grammar: modal verbs of obligation",
          3
        ],
        [
          "Grammar: passive voice with modal",
          3
        ],
        [
          "Grammar: verb form after modal verb",
          3
        ],
        [
          "Grammar: verb forms with modals",
          3
        ],
        [
          "Grammar: modal verb usage",
          2
        ],
        [
          "Grammar: modal verbs with base form",
          2
        ],
        [
          "Grammar: passive voice with modals",
          2
        ],
        [
          "Grammar: verb forms after modal",
          2
        ],
        [
          "Grammar: verb forms after modal verbs & vocabulary",
          2
        ],
        [
          "Grammar: verbs after modal verbs",
          2
        ],
        [
          "Grammar: inversion, modal verbs",
          1
        ],
        [
          "Grammar: modal obligation",
          1
        ],
        [
          "Grammar: modal verb + base verb",
          1
        ],
        [
          "Grammar: modal verb construction",
          1
        ],
        [
          "Grammar: modal verbs (obligation)",
          1
        ],
        [
          "Grammar: modal verbs & vocabulary",
          1
        ],
        [
          "Grammar: modal verbs + base form",
          1
        ],
        [
          "Grammar: modal verbs + vocabulary",
          1
        ],
        [
          "Grammar: modal verbs and collocation",
          1
        ],
        [
          "Grammar: modal verbs and idioms",
          1
        ],
        [
          "Grammar: modal verbs and inversion",
          1
        ],
        [
          "Grammar: modal verbs in requests",
          1
        ],
        [
          "Grammar: modal verbs of possibility",
          1
        ],
        [
          "Grammar: modal verbs, Vocabulary: business",
          1
        ],
        [
          "Grammar: modal verbs, Vocabulary: marketing",
          1
        ],
        [
          "Grammar: modal verbs/adverbs",
          1
        ],
        [
          "Grammar: Modals",
          1
        ],
        [
          "Grammar: verb after modal",
          1
        ],
        [
          "Grammar: verb choice after modal",
          1
        ],
        [
          "Grammar: verb forms (modal verbs)",
          1
        ],
        [
          "Grammar: verb forms after modal auxiliaries",
          1
        ],
        [
          "Grammar: verb forms after modal verbs & idiom",
          1
        ],
        [
          "Grammar: verb forms after modal verbs, Business vocabulary",
          1
        ],
        [
          "Grammar: verb forms with modal verbs",
          1
        ],
        [
          "Vocabulary: verb meaning and modal usage",
          1
        ]
      ]
    },
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        "hard": 32
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          "were",
          65
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        [
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          37
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        [
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          23
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        [
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          7
        ],
        [
          "was",
          7
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        [
          "has",
          6
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        [
          "outlines",
          4
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        [
          "aligns",
          2
        ],
        [
          "attended",
          2
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        [
          "indicate",
          2
        ],
        [
          "sets",
          2
        ],
        [
          "support",
          2
        ],
        [
          "allows",
          1
        ],
        [
          "answers",
          1
        ],
        [
          "arise",
          1
        ],
        [
          "attend",
          1
        ],
        [
          "checks",
          1
        ],
        [
          "demonstrates",
          1
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        [
          "enhance",
          1
        ],
        [
          "exceeds",
          1
        ],
        [
          "greets",
          1
        ],
        [
          "indicates",
          1
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        [
          "leads",
          1
        ],
        [
          "match",
          1
        ],
        [
          "meets",
          1
        ],
        [
          "monitors",
          1
        ],
        [
          "motivates",
          1
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        [
          "needs",
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        [
          "plans",
          1
        ],
        [
          "praises",
          1
        ]
      ],
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          84
        ],
        [
          "Grammar: subject-verb agreement (neither...nor)",
          61
        ],
        [
          "Grammar: subject-verb agreement with intervening phrases",
          5
        ],
        [
          "Grammar: subject-verb agreement (simple present)",
          4
        ],
        [
          "Grammar: subject-verb agreement (with 'along with')",
          4
        ],
        [
          "Grammar: subject-verb agreement (present simple)",
          3
        ],
        [
          "Grammar: neither...nor subject-verb agreement",
          2
        ],
        [
          "Grammar: Subject-verb agreement",
          2
        ],
        [
          "Grammar: subject-verb agreement (along with)",
          2
        ],
        [
          "Grammar: subject-verb agreement (neither... nor)",
          2
        ],
        [
          "Grammar: Subject-verb agreement (neither...nor)",
          2
        ],
        [
          "Grammar: subject-verb agreement (with intervening phrases)",
          2
        ],
        [
          "Grammar: subject-verb agreement with 'along with'",
          2
        ],
        [
          "Grammar: subject-verb agreement with correlative conjunctions",
          2
        ],
        [
          "Grammar: subject-verb agreement, present tense",
          2
        ],
        [
          "Grammar: inversion (negative expressions) and subject-verb agreement",
          1
        ],
        [
          "Grammar: inversion (not until), subject-verb agreement",
          1
        ],
        [
          "Grammar: inversion with negative adverbs, subject-verb agreement",
          1
        ],
        [
          "Grammar: subject-verb agreement (collective nouns)",
          1
        ],
        [
          "Grammar: subject-verb agreement (compound subject)",
          1
        ],
        [
          "Grammar: subject-verb agreement (compound subjects)",
          1
        ],
        [
          "Grammar: subject-verb agreement (data as singular)",
          1
        ],
        [
          "Grammar: subject-verb agreement (data)",
          1
        ],
        [
          "Grammar: subject-verb agreement (indefinite pronouns)",
          1
        ],
        [
          "Grammar: subject-verb agreement (neither of)",
          1
        ],
        [
          "Grammar: subject-verb agreement (neither... nor...)",
          1
        ],
        [
          "Grammar: subject-verb agreement (parenthetical phrase)",
          1
        ],
        [
          "Grammar: subject-verb agreement (passive voice)",
          1
        ],
        [
          "Grammar: subject-verb agreement (past tense)",
          1
        ],
        [
          "Grammar: subject-verb agreement (phrases with 'along with')",
          1
        ],
        [
          "Grammar: subject-verb agreement (present perfect)",
          1
        ],
        [
          "Grammar: subject-verb agreement (singular)",
          1
        ],
        [
          "Grammar: Subject-verb agreement (with 'along with')",
          1
        ],
        [
          "Grammar: subject-verb agreement (with intervening phrase)",
          1
        ],
        [
          "Grammar: subject-verb agreement / relative pronouns",
          1
        ],
        [
          "Grammar: subject-verb agreement and passive voice",
          1
        ],
        [
          "Grammar: subject-verb agreement in conditional clauses",
          1
        ],
        [
          "Grammar: subject-verb agreement with 'every'",
          1
        ],
        [
          "Grammar: subject-verb agreement with 'neither...nor'",
          1
        ],
        [
          "Grammar: subject-verb agreement with compound subjects",
          1
        ],
        [
          "Grammar: subject-verb agreement with neither...nor",
          1
        ],
        [
          "Grammar: subject-verb agreement with parenthetical phrases",
          1
        ],
        [
          "Grammar: subject-verb agreement, passive voice",
          1
        ],
        [
          "Grammar: subject-verb agreement, present perfect",
          1
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        "hard": 277
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          15
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        [
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          "wear",
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        [
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          12
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          3
        ],
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          "exceed",
          3
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        [
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          3
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          14
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          7
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          8
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          8
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          7
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          7
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        [
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          6
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          6
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          6
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