1. …May I come in?
2. Let me look at your exercises. I …shall be able to help you.
3. I …cannot swim, because until this year the doctor did not allow me to be more than two minutes in the water. But this year he says I …can stay in for fifteen minutes if I like, so I’m going to learn to swim.
4. Libraries are quite free, and any one who likes …can get books there.
5. I …may come and see you tomorrow if I have time