第1个回答 2008-07-12
要分情况的
Can I go home now? No,you can't
May I borrow your ruler? No, you can't
Must I sweep the floor? No, you needn't
第2个回答 2008-07-12
can--can't
may--may not
must--mustn't本回答被提问者采纳
第3个回答 2019-08-26
答案是:d
当请求别人帮忙是用may,但肯定回答时不能用情态动词may,只能用
can
第4个回答 2008-07-12
can-can`t
may-may not
must-don`t must