1、He often gets up early
→He often gets up early
析：含有often ， always等的肯定句变否定句，需分别将它们换成否定副词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（宁愿）等相当于一个情态动词，后接动词原形，且没有人称、数和时态的变化。故其否定式分析为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的肯定句变否定句，只需去掉前面的不定冠词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的肯定句除加副词not变否定句外，还需将它们换成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作主语时，谓语不可用not构成否定，如需否定必须换成no或no的合成词作主语的否定式。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及其合成词anyone,anybody,anything作主语时，构成否定句的方式与上相同。又如：
Anybody can do it well.
→Nobody can do it well.
7、He is kniwn.
→He is unknown.
析：某些形容词能用前缀un构成否定时，则用其否定前缀形成。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来构成否定。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来构成否定。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来构成否定。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连接并列成分的肯定句变否定句时，应将andn改为or,表示前后成分均被否定，and前后为名词时，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动词前加Don't但以let开头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“过云常常”做某事，其否定式通常用used not或never used to,上语中也可用did not use to.
13、They ought to do so.
→They ought to do so.
析：ought to为情态动词，其意相当于should,其否定形式为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等表示揣测的动词引起宾语从句时，如需否定，要否定主句谓语动词，而不否定从句，这种现象叫做否定前移。但在hope引起的宾语从句中，则不需要否定前移。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“陈述句+so+助（系情态）动词+主语”结构中，若改为否定句，除陈述部分加副词not外，还需将so改为neither或nor。
16、He must be on the playground.
析：当must be用来表示推测，有“一定”的含义时，否定式要用can not.
17、You must say something at the mecting.
→You needn't say anything at the mecting.
析：当“must+行为动词”用来表示“必须”的含义时，其否定式可用nccdn't 或mustn't表示“不需要”，“不必”，语气委婉，must not表示“禁止”，“千万别”语气生硬。
18、You may come in now.
→You mustn't come in now.
析：may作为情态动词表示“可以”时，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：当have(has),do作定义动词，变成否定句时，不能有接在其后加not,而要根据时态选用适当的助动词（do,does,did）否定，再将该实义动词还原。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：当neel、dare作实义动词时，其否定式不能在其后加not,而要根据时态在其前加助动词进行否定。
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