Which sentence correctly uses the modal perfect ‘must have’ to express a confident deduction about the past?
AShe must forgetting her keys.
BShe must has forgotten her keys.
CShe must forgot her keys.
DShe must have forgotten her keys.
Explanation
To express a confident guess or deduction about something that happened in the past, English uses the structure ‘must have’ followed by the past participle, giving ‘must have forgotten.’ This modal perfect construction is used when a speaker is fairly certain about a past event based on available evidence, rather than expressing present obligation, which is the more familiar use of ‘must.’ Explore more English MCQs on mcqstutor to keep practicing.
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