The teacher can’t have allowed the boy to use a dictionary.
Nick can’t have got up at seven and done his morning exercises.
It can’t have been Kate who aired the room.
There can’t have been so many pupils in the library yesterday.
It can’t have been John who broke the CD player.
You can’t have seen Ann in the library yesterday.
Boris can’t have been in the canteen five minutes ago.
Robert can’t have taken two bags with him.
That can’t have been Ann who plugged in the tape recorder.
Nick can’t have been listening to music for two hours.
It can’t have been Mary who rewound the tape.
The teacher can’t have let you take the tape home.