肯定句变否定句【肯定句变否定句九则】
时间：2018-12-28 03:26:36 来源：柠檬阅读网 本文已影响 人 
一、句中有be动词（指is , am , are , was , were）、情态动词（指can , may , must…）、助动词（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、句中的谓语动词是原形、第三人称单数、过去式的，则应在谓语动词的前面分别加上do not(don"t) , does not(doesn"t) , did not(didn"t)，切记：把谓语动词变为原形。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、句子为祈使句的，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、句中有不定代词all , both , everybody , everything的，如变为完全否定句，both要变为neither、all要变为none、everybody要变为nobody、everything要变为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、句中有频度副词always的，变完全否定句时，要把always改为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)引导的宾语从句，变否定句时，直接在主句中的动词think ,
believe , suppose的前面加don"t , doesn"t , didn"s进行否定。如：
15.I think you are right.
I don"t think you are right.
八、句中有两个助动词同时出现时，只需在第一个助动词后面加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”讲时，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”讲时，则只能在其前面加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”讲）
19.He has a nice watch.
He has not a nice watch.
He doesn"t have a nice watch.
（作“有”讲）
20.We have lunch at 12 o"clock every day.
We don"t have lunch at 12 o"clock every day.
（不作“有”讲）
