Tom: Can I come in, Mum?
Mum: Yes, please.
Tom: What are you doing?
Mum: I'm making cakes.
Tom: Oh, I'm hungry. Can I have a cake, please?
Mum: Yes, you can.
Tom: The cake is good. Can I go out?
Mum: No, you can't. You're ill. You can watch TV.
Tom: OK, Mum.