It is possible that she has gone to the shops, but it is also possible that she has gone somewhere else."might have": we believe it's possible that the action happened, but we don't know.She usually takes her car so I deduce that she has definitely not left the house because her car is outside (the opposite of "must have")."She can’t have left the house yet because her car is still outside.". "can't have": we believe the action definitely did not happen (the opposite of "must have").She usually leaves her house before 11 o’clock so I deduce that she has definitely left the house."She must have left the house by now it’s nearly 11 o'clock."."must have": we believe the action definitely happened.We use "must have", "can't have" and "might have" in the same way as the present perfect - the action we are describing happened, or did not happen, in the past and is still true in the present. We use the modal verbs "must have", "can't have" and "might have" to make guesses or deductions about an action in the past that we believe has definitely happened, has definitely not happened or possibly happened, based on our knowledge, information or evidence, or lack of it.
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