You must have left your exercise book at school.
She must have left the town.
Mike must have gone to the teachers’ room.
Tom and Nick must be playing football.
Helen must have got a bad mark.
They must have solved the problem.
The pupils must have finished writing their essay.
He must have forgotten to warn them.
The meeting must have been cancelled.
He must have forgotten to send her a birthday card.
There must have been something wrong with the tape recorder.
I must have left my bag in the canteen.
You must have left your umbrella in the bus.
Mary must have forgotten to call me.
Mother must have taken my umbrella.
I must have seen you before: your face is familiar to me.