Comlete the dialogues. Use the verds from the box. can-can't-may-must-should 1) -Sir,... I come in? -No,you mae not.

1) — Sir, May I come in? — No, you may not. You are late. You must come to class earlier. 2) — Tom, can you help your mother now? — Yes, dad. By the way, I always help her. I know that children must help their parents. 3) — Jane, your grandad is ill. He is in hospital. You should visit him. Can you do it today? — No, mum, I can\'t. I\'ll go there tomorrow.