情态动词can,may,must的肯定形式和否定形式是什么
问题描述：
情态动词can,may,must的肯定形式和否定形式是什么
答
肯定形式就是can may must 否定形式就是分别在后面加not
答
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
答
can't
may not
needn't/mustn't
答
can-can`t
may-may not
must-don`t must
答
can--can't
may--may not
must--mustn't