A.
- Sir, ___ I come in?
- No, you ___ not. You are late. You ___ come to class earlier.

B.
- Tommy, ___ you help your mother now?
- Yes. By the way, dad, I always help her. I know that children ___ help their parents.

C.
- Jane, your grandad is ill. He is in hospital. You ___ visit him. ___ you do it today?
- No, mum, I ___ . I'll go there tomorrow.