must have, might have, can’t have + past participle

​Must have + past participle

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Must have to talk about things you feel sure have happened.​

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Example:

Something bad must have happened.​

​Might have + past participle

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Might have to talk about things that have perhaps happened.​

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Example:

She might have won a competition.

​Can't have + past participle

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Can’t have to talk about things you feel sure haven’t happened.

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Example:

​It can’t have been good news.

Fill in the Blanks

She

have been on the bus. (I'm fairly sure this is a good guess)

Fill in the Blanks

She

have gotten lost. (maybe)

Fill in the Blanks

She

have gone home. (I'm fairly sure this isn't true)

Fill in the Blanks

She

have worked late. (possibility)

Fill in the Blanks

She

have forgotten about our date. (very sure)