I have learned that
It occurred to me that Mary may have missed the bus. [wrong]
It occurred to me that Mary might have missed the bus.
But I found the following sentence in some books,
It occurred to me that Mary must have missed the bus.
Is this sentence correct because "must" does not have its past tense form?
Is this an exceptional case?
Thank you.
anonymous It occurred to me that Mary may have missed the bus. That seems perfectly natural and grammatical to me.
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anonymousIt occurred to me that Mary may have missed the bus.
That seems perfectly natural and grammatical to me.