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Difficulty: HardModal Auxiliaries and Expressing Modality

Considering that the doors were locked from the inside and all security alarms were active until morning, the nocturnal intruder ________ inside the building before the staff departed for the evening. Which option correctly completes the sentence to express a strong past logical deduction?

  1. must have hiddenAnswer
  2. B
    might can have hidden
  3. C
    must to have hidden
  4. D
    oughted to have hidden

Answer

The correct option is 'must have hidden', which appropriately expresses a logical deduction about a past event using 'must + have + past participle'.
The phrase 'must have hidden' correctly conveys a past logical deduction drawn from clear surrounding evidence. In English grammar, past logical conclusions are constructed using 'must' followed by the perfect infinitive ('have' + past participle).

Step-by-Step Solution

1
Analyze the semantic context of the sentence
The sentence presents physical evidence (locked doors, active alarms) pointing to a logical conclusion about a past event.
Determining whether the context demands past obligation, permission, capability, or past logical deduction guides modal selection.
2
Identify the required modal auxiliary structure for past deduction
A past logical certainty requires the auxiliary pattern 'must + have + past participle'.
Pure modals cannot take past tense inflections directly and require the perfect auxiliary 'have' to refer to past time.
3
Evaluate the choices for grammatical correctness and modal syntax
'must have hidden' follows standard modal syntax, while double modals ('might can') and non-standard inflections ('must to', 'oughted to') are ungrammatical.
Modal auxiliaries in English do not take infinitive 'to' markers, cannot be stacked consecutively, and do not accept inflectional suffixes.

Key Concept

Modal Auxiliaries for Past Logical Deduction
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Topics

Modal Auxiliaries and Expressing Modality

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