1、He often gets up early

→He often gets up early

析：含有often ， always等的肯定句變否定句，需分別將它們換成否定副詞seldom，never。又如：

she always gets up early

→she always gets up early

2、You'd botter write to him at once

→You'd botter write to him at once

析：had botter，would rather（寧愿）等相當(dāng)于一個(gè)情態(tài)動(dòng)詞，后接動(dòng)詞原形，且沒有人稱、數(shù)和時(shí)態(tài)的變化。故其否定式分析為had better not和would rather not。又如：

I would rather sing an English song.

→I would rather sing an English song.

3、There is a little ink in the bottle.

→There is a little ink in the bottle.

析：含有a little，a few的肯定句變否定句，只需去掉前面的不定冠詞a即可。又如：

I have a few friends here.

→I have a few friends here.

4、He is a student,too.

→He is not a studcnt,cither.

析，含有too,also的肯定句除加副詞not變否定句外，還需將它們換成either放在句末，又如：

she also likes football.

→she doesn't like football,either.

5、Everything is ready.

→Nithing is ready.

析：everything,everybody,everyone作主語時(shí)，謂語不可用not構(gòu)成否定，如需否定必須換成no或no的合成詞作主語的否定式。又如：

Everybody has been the film.

→Nobody has seen the film.

6、Any child can sing the song.

→No child can sing the song.

析：any及其合成詞anyone,anybody,anything作主語時(shí)，構(gòu)成否定句的方式與上相同。又如：

Anybody can do it well.

→Nobody can do it well.

7、He is kniwn.

→He is unknown.

析：某些形容詞能用前綴un構(gòu)成否定時(shí)，則用其否定前綴形成。又如：

it's a fair.

→It's unfair.

8、Both of the boys go in for sports.

→Ncither of boys go in tor sports.

析：含有both,both……and……，not only……but alsor肯定句常用neither或neithe……nor來構(gòu)成否定。又如：

Both john and jack were reading English at six in the morning yesterday.

→Neither john nor jack was reading English at six in the morning yesterday.

9、All of us know(knows)Russian.

→None of us know(knows)Russian.

析：含有all的肯定句常用none或no one來構(gòu)成否定。又如：

All my friends were presend at the meeting.

→None of my friends were present.

析：含有all的肯定句常用none或no one來構(gòu)成否定。又如：

All my friends were present at the meeting.

→None of my friends were present.

10、I know German and French.

析：含有and連接并列成分的肯定句變否定句時(shí)，應(yīng)將andn改為or,表示前后成分均被否定，and前后為名詞時(shí)，也可用no……and no……表示否定。又如：

it has no eyes and no ears=it has no eyes or ears.

11、shut the door.

→Don't shut the door.

析：一般祈使句的否定形式在動(dòng)詞前加Don't但以let開頭的祈使句否定形式可直接在不定式前加not，或在let前加don't，如：

let him do it.

→let him not do it.或Don't let him do it.

12、He used to go there.

→He uscd not go there=He ncvcr uscd to go there.=He did not usc to go there.

析：used to表示“過云常常”做某事，其否定式通常用used not或never used to,上語中也可用did not use to.

13、They ought to do so.

→They ought to do so.

析：ought to為情態(tài)動(dòng)詞，其意相當(dāng)于should,其否定形式為ought not to.

14、I think that the answer is right.

→I don't think that the answer is right.

析：在think,believe,suppose,expect,feel等表示揣測的動(dòng)詞引起賓語從句時(shí)，如需否定，要否定主句謂語動(dòng)詞，而不否定從句，這種現(xiàn)象叫做否定前移。但在hope引起的賓語從句中，則不需要否定前移。如：

I hope she will come.

→I hope she will come.

15、He can swim,so can I.

→He can swim,neither(nor) can I

析：在“陳述句+so+助（系情態(tài)）動(dòng)詞+主語”結(jié)構(gòu)中，若改為否定句，除陳述部分加副詞not外，還需將so改為neither或nor。

16、He must be on the playground.

析：當(dāng)must be用來表示推測，有“一定”的含義時(shí)，否定式要用can not.

17、You must say something at the mecting.

→You needn't say anything at the mecting.

析：當(dāng)“must+行為動(dòng)詞”用來表示“必須”的含義時(shí)，其否定式可用nccdn't 或mustn't表示“不需要”，“不必”，語氣委婉，must not表示“禁止”，“千萬別”語氣生硬。

18、You may come in now.

→You mustn't come in now.

析：may作為情態(tài)動(dòng)詞表示“可以”時(shí)，其否定式用must not,而不用may not.

19、She has supper at six.

→She doesn't have supper at six.

析：當(dāng)have(has),do作定義動(dòng)詞，變成否定句時(shí)，不能有接在其后加not,而要根據(jù)時(shí)態(tài)選用適當(dāng)?shù)闹鷦?dòng)詞（do,does,did）否定，再將該實(shí)義動(dòng)詞還原。如：

He does morning exercises every day.

→He doesn's do morning exercises every day.

20、I need your help.

→I don't need your help.

析：當(dāng)neel、dare作實(shí)義動(dòng)詞時(shí)，其否定式不能在其后加not,而要根據(jù)時(shí)態(tài)在其前加助動(dòng)詞進(jìn)行否定。