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maxresdefault - Coggle Diagram
Use when you are really sure about something.
He must have failed the exam.
For the negative form, can't is used, not mustn't.
Use when you think it is not true.
She can't have been asleep.
The structure "Couldn't + Have + V3 also means the same thing.
Use when you think you are not
sure about a situation.
We may have gotten up earlier than them.
She might have gotten up earlier than us.
I could have gotten up earlier than you.
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