May I .... ? 是征求意见的用法
1、肯定回答：
1).Yes, you can/may.
2). Of course (you can).
3). Sure
4). Yes, please .
2、否定回答：
1). No, you can't / mustn't.
2).I'm afraid you can't.
3).You'd better not.
注：否定回答不能用 No, you may not .
拓展：
含有情态动词的一般疑问句的答语：
Can I .... ?
Yes, you can.
No, you can't.
Must I ... ?
Yes, you must .
No, you needn't / don't have to.