變否定句方法

1．Be ( 一般現(xiàn)在時(shí)is / are / am 一般過去時(shí)was/ were ) ， 在be 后面加not .

縮寫 ： isn’t aren’t wasn’t weren’t

1）。 She is at home now。 → She is not at home now . = isn’t

2) They are playing basketball ?！?They are not playing basketball 。 = aren’t

3） I am a teacher .→ I am not a teacher 。

4) He was asleep . → He was not asleep . =wasn’t

5)We were happy at the party → We were not happy at the party . weren’t

2. 在情態(tài)動(dòng)詞 can ， could ， must ,should ,may ，will , would，shall等后面加not 。

縮寫 ： can’t , couldn’t ， mustn’t ,shouldn’t, may not ，won't , wouldn’t ， shalln’t

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1）He can swim in the river 。 → He can not swim in the river .

2)We should clean the room 。 → We should not clean the room .

3）He can read and write． → He can’t read or write．

3. 謂語動(dòng)詞是行為動(dòng)詞時(shí)，在該動(dòng)詞前加上don't ／doesn't／didn’t，動(dòng)詞用動(dòng)詞原形.如：1)He gets up early． → He doesn't get up early．

2)They go to school on foot → They don’t go to school on foot 。

3)She saw Liu Xiang yesterday 。 →She didn’t see Liu Xiang yesterday .

He /she / it / Lucy / Li Lei 當(dāng)主語是第三人稱單數(shù)時(shí) ， 用 doesn’t

They /we / you/ my parents / I 當(dāng)主語是復(fù)數(shù)和第一人稱I時(shí)， 用don't

當(dāng)He /she/ it/ Lucy/ LiLei/ They/ we/ you/ my parents/ I 過去時(shí)都用

didn't

4。 用含否定意義的詞或詞組取代肯定句中的某些詞或詞組。如：

I know both English and Chinese． → I know neither English nor Chinese．

類似的有：ever /always → never somebody → anybody too →

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either

something →anything everybody → no one almost →hardly

already → yet often → seldom Neither…nor → Both 。.。and

5．祈使句的肯定式變否定式

(1）一般在動(dòng)詞前加上 don’t.如： Open the window Don’t open the window．

(2)含有“Let's．．．\"的祈使句,一般用“Let’s not……”

Let’s go there．→ Let's not go there．

6．復(fù)合句的肯定句變否定句方法

一般將主句變?yōu)榉穸ㄊ?。?I saw her when I left I didn’t see her when I left．

7。 例題

1). I think she is there。 → I don’t think she is there

分析:賓語從句前面的動(dòng)詞是think， believe, expect， suppose .

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→ → ．．

變否定句時(shí)， 即否定主句謂語，不否定賓語從句謂語。

2）。 He can sing this song and that one .

He can not sing this song or that one 。

3)。 Tom went to school , too.

Tom didn’t go to school , either.

4）。 He has had supper already .

He hasn't had supper yet 。 助動(dòng)詞has / have / had （not）+ 過去分詞

5）。 He had a good rest just now.

He didn’t have a good rest just now。

分析：has / have / had表示開會(huì)、吃飯、休息、進(jìn)行體育鍛煉是行為動(dòng)詞，

變否定句時(shí)，借用助動(dòng)詞doesn’t / don’t / didn’t ， 后面再接動(dòng)詞原形 。

6）。 Let’s do it。 → L et’s not do it.

7）. He always gets there on time. → He never gets there on time.

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8). It often rains here. → It seldom rains here.

9）。 Be here early tomorrow. → Don't be here early tomorrow。

10）. You had better come。 → You had better not come。

11）。 Both Tom and Xiao Ping went to school。 →

Neither Tom nor Xiao Ping went to school.

8。鞏固練習(xí)：

1).I think they will fly to tomorrow.

I they fly to tomorrow 。

2)。He has some colour lights,too。

He colour lights，

3).I have to tell her the bad news.

I her the bad news.

4）。She needs some pieces of paper。

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She pieces of paper.

5)。The idea sounds great.

The idea great。

6)。We had a good time at the party。

We a good time at the party.

7）.David has to help his mother in the kitchen。

David to help his mother in the kitchen.

8)。Lily has done that already。

Lily that 。

9）.The evening party had already finished by the time I got there.

The evening party finished by the time I got there。

10).My father can play both baseball and golf。

My father can play baseball golf。

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11).Li Dam and Li Shuang like watching cartoons very much。

Li Dam and Li Shuang don’t like watching cartoons 。

12).Both of his parents teach English in a university.

of his parents English in a university.

13)。My sister and I have once been to Beijing。

My sister and I been to Beijing 。

14）。You’d better go to the hospital to see a doctor.

You’d better the hospital to see a doctor.

15）。We can see somebody sitting under the tree。

We see sitting under the tree。

16)。He does eye exercises every day。

He ___ __ ____ _ eye exercises every day.

17)。I’ve ever been to Beijing three times.

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I ____ _ _____ been to Beijing three times.

18). Lucy will stay there for some time。 → Lucy ____ _ stay there for ___ __ time.

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