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Play detective and deduce why the family dog walked into the house completely drenched. Select ALL the sentences that use grammatically valid past modals of deduction to explain this mystery.
The correct answers are He must have jumped into the neighbor's pool and He might have chased a frog into the pond.
Must have + past participle correctly expresses strong certainty about the past, while might have + past participle correctly expresses a past possibility.
"Can have" is grammatically incorrect for affirmative past deductions (we use could have instead). "Must has" is incorrect because modal verbs must always be followed by the base form of the verb (have), never has.