情态动词否定

二. may 1) 可以 （否定用： may not 不可以、不能） 2）可能（猜测）（否定要 用：1）can’t :不可能；2） may not:可能不）
三 have to/had to /has to （否定、疑问要通过用： do/did/does）: You don’t have to go there. He did not have to get up early yesterday.
1.You needn’t/don’t have to finish your homework today. 2.You may not/can’t go out with your friends and… 3.The man standing at the gate can’t be Anna’s father. 4.You should not have told him the truth yesterday.
9.I didn’t have to go there on foot that day.=the other day 10.You should not spend the summer holiday with her.
一.must : 1)一定（要）（否 定要用：needn’t/don’t have to） 2)一定（猜测） （否定要用：can’t 不一 定）
十一.used to do used not to do / didn’t use to do 十二 . seem to do seem not to do/ doesn’t /don’t seem to do/didn’t seem to do
5.We will not haBiblioteka Baidue to wait for another hour for the next bus. 6.You ought not to stop drinking cola. 7. He can’t have left the countryside. 8.You’d better not give her a reply when you meet her.
四 .have a rest/had a rest/has a rest (否 定、疑问要通过用： do/did/does)：We don’t have a rest in the morning. He didn’t have a drink just now. Does he have a rest ?
五 .had better 后面加 not: had better not do 六 ought to: ought后面加 not : ought not to do 七 can’t have done不可能 干了 八 need not have done 大 有不必干某事的
九. ---May I come in ? --- No, you mustn’t. 十.---Must I hand in my homework right now ? --- No, you needn’t/don’t have to.