Ex.4
2) A: May I open the window, please?
B: Of course you may.
3) A : May I eat my lunch in my bedroom, please?
B: No, you may not. Eat it in the kitchen, please.
4) A: May I ask you a question, please?
B: Yes, of course.
5) A: May I have some more chocolate, please?
B: No, you may not.
6) A: May I have a glass of water?
B: Yes, of course.
Мау пишется если предложение утвердительное,мау not пишется в отрицательных предложениях.