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.