情态动词否定

1、1.You neednt/dont have to finish your homework today.2.You may not/cant go out with your friends and3.The man standing at the gate cant be Annas father.4.You should not have told him the truth yesterday.5.We will not have to wait for another hour for the next bus.6.You ought not to stop drinking col

2、a.7. He cant have left the countryside.8.Youd better not give her a reply when you meet her.9.I didnt have to go there on foot that day.=the other day10.You should not spend the summer holiday with her.一.一.must : 1)一定（要）（否一定（要）（否定要用：定要用：neednt/dont have to） 2)一定（猜测）一定（猜测）（否定要用：（否定要用：cant 不一不一定）定）二二.

3、 may 1) 可以可以 （否定用：否定用：may not 不可以、不能）不可以、不能）2）可能（猜测）（否定要）可能（猜测）（否定要用：用：1）cant :不可能；不可能；2）may not:可能不）可能不）三三 have to/had to /has to （否定、疑问要通过用：否定、疑问要通过用：do/did/does）: You dont have to go there.He did not have to get up early yesterday.四四 .have a rest/had a rest/has a rest (否否定、疑问要通过用：定、疑问要通过用：do/did/

4、does)：We dont have a rest in the morning.He didnt have a drink just now. Does he have a rest ?五五 .had better 后面加后面加 not: had better not do六六 ought to: ought后面加后面加not : ought not to do七七 cant have done不可能不可能干了干了八八 need not have done 大大有不必干某事的有不必干某事的九九. -May I come in ? - No, you mustnt.十十.-Must I hand in my homework right now ?- No, you neednt/dont have to. 一一一一.used to do used not to do / didnt use to do 一二一二