May I / we 这一类疑问句的肯定回答为Yes,please.或Certainly；否定回答为Please don’t.或No,you mustn’t.例如：
“May we leave now?” “No,you mustn’t.You haven’t finished your home work yet.”
May I go home now?现在我可以回家了吗?1) No,you can't.不,你不能回去.2) No,you mustn't.　不,你千万别走.