Hurry up: you may miss the train.
He may have fallen ill.
He may be ill.
He can’t have forgotten to buy flowers.
He can’t have quarreled with her.
She must have learned about it from Kate.
It must have been a very difficult problem.
It must be very cold outside.
He must have met them on the way home.
They can’t have sold their house.
They may come tomorrow.
My sister must be at the university now.
He can’t have taken first place.
He might have heard about it.
Mother must have bought sweets.
She may have rung me up yesterday, but I was out.
He might be at school now.
She can’t be so young. She must be at least forty.
There must be thick woods growing around your village.
He can’t have written the letter so soon.
We may go to the beach: the weather is wonderful.
It must be a very ancient manuscript.
Let’s ring up Robert: we may need his advice.