肯定句變否定句九則

一、句中有be動詞（指is ， am ， are ， was ， were）、情態動詞（指can ， may ， must…）、助動詞（指will ， shall ， have ， has ， had）的，在其后面直接加not。如：

1.He is a student.

He is not a student

2.Her mother can speak Japanese.

Her mother can not speak Japanese

3.They will go to Beijing next Sunday.

They will not go to Beijing next Sunday

4.You have already watched this TV play.

You have not watch this TV play yet.

二、句中的謂語動詞是原形、第三人稱單數、過去式的，則應在謂語動詞的前面分別加上do not(don't) ， does not(doesn't) ， did not(didn't)，切記：把謂語動詞變為原形。如：

5.I get up at 6:00 in the morning every day.

I don't get up at 6:00 in the morning every day.

6.She likes swimming.

She doesn't like swimming.

7.He asked me a question yesterday.

He didn't ask me a question yesterday.

三、句子為祈使句的，在句首直接加Don't。如；

8.Look at the blackboard.

Don't look at the blackboard.

四、句中有had better的，在其后面直接加not，如：

9.You had better go to school now.

You had better not go to school now.

五、句中有不定代詞all ， both ， everybody ， everything的，如變為完全否定句，both要變為neither、all要變為none、everybody要變為nobody、everything要變為nothing。如：

10.Both of us are at school.

Neither of us is at school.

11.All of them are playing basketball now.

None of them is playing basketball now.

12.Everybody likes watching TV.

Nobody likes watching TV.

13.I know everything about you.

I know nothing about you.

六、句中有頻度副詞always的，變完全否定句時，要把always改為never。如：

14.He always gets up at 10 o'clock on Sundays.

He never gets up at 10 o'clock on Sundays.

七、由 I think(believe ， suppose)引導的賓語從句，變否定句時，直接在主句中的動詞think ，

believe ， suppose的前面加don't ， doesn't ， didn's進行否定。如：

15.I think you are right.

I don't think you are right.

八、句中有兩個助動詞同時出現時，只需在第一個助動詞后面加not。如：

16.The girl will be sorry for that.

The girl will not be sorry for that.

17.He may be able to drive the car.

He may not be able to drive the car.

九、句中的have / has作“有”講時，即可以在其后面直接加not，也可以在其前面加don't / doesn't / didn't ; have / has不作“有”講時，則只能在其前面加don't / doesn't / didn't。如：

18.They have a big classroom.

They have not a big classroom.

They don't have a big classroom.

（作“有”講）

19.He has a nice watch.

He has not a nice watch.

He doesn't have a nice watch.

（作“有”講）

20.We have lunch at 12 o'clock every day.

We don't have lunch at 12 o'clock every day.

（不作“有”講）