She can't have gone to London on her own. She must have gone to London with a friend., to make guesses about the past when we are sure something happened/didn't happen, She could have caught the train. He must have forgotten his appointment., to talk about possible events in the past, You ought to/should have told the truth. I had to leave at 6 o'clock., to talk about obligation in the past, We didn't have to wait long for the bus., to talk about lack of obligation in the past, You shouldn't have told so many lies., to talk about prohibition in the past.

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