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【一】:英语句型转换之一肯定句变否定句的方法技巧
英语句型转换之一 ——肯定句变否定句的技巧
请同学们记住以下单词：
1、be动词的五种形式：am, is, are, was, were；
2、情态动词：can, could, may, might, must, shall, should,
will,would, need, had better
3、助动词：have, has, had
一、动词后直接加not
原句中含有be动词(am, is, are, was, were) 和情态动词(can, shall, will, may, should, would, might, had better等)时，要在动词后直接加not。如：
1. I am a teacher. → I am not a teacher.
2. Li Lei can swim. → Li Lei cannot（ can't ）swim.
3. He will go to the zoo if it rains tomorrow.
→ He will not（won't）go to the zoo if it rains tomorrow.
4. We have learned 3,000 words.
→ We have not（ haven't ）learned 3,000 words.
二、原句中没有be动词，助动词或情态动词时，要在行为动词前加助动词(do, does, did)与否定副词not的缩写形式。
1. 句中第一个动词是原形时，在其前加上don’t。如：
I get up at six o'clock every day.
→ I don't get up at six o'clock every day.
2. 句中第一个动词是三单形式时，在其前加上doesn’t，原来的动词三单形式改为动词原形。如：
Mr Wang works in a factory.
→ Mr Wang doesn't work in a factory.
3. 句中第一个动词是过去式时，在其前加上didn’t，原来的动词过去式改为动词原形。如：
Xia Lin visited our friends last night.
→ Xia Lin didn't visit our friends last night.
三、肯定句变否定句的七点注意
1. 肯定句变否定句时，除将谓语变为否定式外，句中其他词语也可能随之改变，如将some改为any，too和also改为either，already改为yet，and改为or等。如：
There are some birds in the tree. 树上有些鸟。
→There aren’t any birds in the tree. 树上没有鸟。
He likes the girl, too. 他也喜欢这个女孩。
→He doesn’t like the girl, either. 他也不喜欢这个女孩。
We have already seen the film. 我们已看过这部电影。
→We have not seen the film yet. 我们没有看这部电影。
He likes singing and dancing. 他喜欢唱歌和跳舞。
→He doesn’t like singing or dancing. 他不喜欢唱歌和跳舞。
2. 复合句的肯定式变否定式
a. 在含有宾语从句的主从复合句中，当主句的主语是第一人称，谓语动词是think, believe, guess时，如果要否定后面的宾语从句，习惯上否定主句的谓语动词。如：
I think he is 13 years old.
→ I don't think he is 13 years old.
I believe she will come here soon.
→I don’t believe she will come here soon
b. 其他一般将主句变为否定式。如：
I was cooking when Mum got home.
→ I was not cooking when Mum got home.
3. 不变谓语动词而变其他词语
a. 肯定句中含有 both, both „ and时，变否定句时both →neither；both „ and→neither „ nor；all→none。如：
Both of us are students. all→ Neither of us is a student.
I know both English and Chinese.
→ I know neither English nor Chinese.
All of them like bananas. → None of them like(s) bananas.
b. 肯定句中含有 every-, some- 的合成词，变否定句时常改为含
有 no- 的合成词。如：
Everything is ready. → Nothing is ready.
There is something wrong with my bike.
→ There is nothing wrong with my bike.
c. 肯定句中含有“形容词＋ enough to do sth.”，变否定句时改为“ too ＋形容词的反义词＋to do sth.”。如：
She is old enough to go to school.
→ She is too young to go to school.
d. 肯定句中含有 always 和 ever ，变否定句时改为 never 。如： He is always late for school. → He is never late for school.
My uncle's ever been to many parts of England.
→ My uncle has never been to many parts of England.www.fz173.com_英语肯定句改否定句。
4. 祈使句的肯定式变否定式
a. 一般情况下，在句首的动词前加 Don't 。如：
Close the door. → Don't close the door.
b. 以 Let's 或 Let us 开头的祈使句，在变否定句时常在其后加 not；有时也可在其前加 Don't 。如：
Let me try again.
→ Let me not try again.
→ Don't let me try again.
5. 动词不定式变否定式时，常在不定式符号 to 前加 not 。如： The teacher asked me to speak more loudly.
→ The teacher asked me not to speak more loudly.
6. 部分否定与完全否定
比较以下句子：
All of us laughed when we heard it. 听到这事时我们都笑了。(肯定句)
All of us didn’t laugh when we heard it. 听到这事时我们并未都笑。(部分否定)
Not all of us laughed when we heard it. 听到这事时我们并未都笑。(部分否定)
None of us laughed when we heard it. 听到这事时我们都没笑。(完全否定)
注：可能涉及部分否定的词语有both, all, always, every等，即not both表示“并非两者都”，not all 表示“并非所有的都”，not always 表示“并非总是”，not every表示“并非每个„都”。
7. 需要分清do, does, did, have, has, have, had等是实义动词还是助动词。如果是助动词，则在它们后面直接加not，如果是实义动词，则在它们前面根据实际情况加don’t, doesn’t或didn’t 。如：
He usually does his homework in the evening.
→He usually doesn’t his homework in the evening.（Wrong）
→He doesn’t usually do his homework in the evening.（Right）
Tina has gone home.
→Tina doesn’t have gone home.（Wrong）
→Tina hasn’t gone home.（Right）
把下面的句子变成否定句
1. The old man hurt his leg last Wednesday. (西宁市中考题)
2. Both Joy and Sam like singing Beijing Opera. (新疆中考题)
3. His mother has already called the police for help. (乌鲁木齐市中考题)
4. He knows everything about your school.
5. Put them over there．
6. He likes the girl, too.
7. A lot of people are lying on the beach.
8. He does some reading on Sunday.
9. They like singing and dancing.
10. Cindy did her homework last night.
11. We had some money for the taxi.
12. There are some students in the classroom.
13. This pop singer has a new look.
14. I think he is great.
15. You can listen to music after school.www.fz173.com_英语肯定句改否定句。
16. I have to make lunch at home.
【二】:英语语法之肯定句变否定句
英语语法之肯定句变否定句
学生经常会遇到“把肯定句改为否定句”这样的题目，做这类题目时学生都感到困难，不知如何下手。从他们做题当中我分析了一下，主要存在以下几点问题：①不知道not放在什么位置。②不清楚什么时候借助于“do”的各种形式。③主语为单三时，知道用doesn’t了，但后面的动词又不变为原形。针对这些问题我教给学生一些做题方法。
看到一个句子首先我们要分析这个句子的结构是什么，目前就我们所学到的简单句的句子结构有两种：
①主语+be（am is are）/情态动词（can、could）+其他
②主语+动词+其他（包括：主语（第三人称单数）+动词单三+其他）
当是第一种结构变为否定句时,变后为：主语+be/情态动词+not+其他；
当为第二种结构变为否定句时，变后为：主语+don't+动词+其他
主语（第三人称单数）+动词单三+其他，变后为：主语（第三人称单数）+doesn't +动词原形+其他
1. I am a girl.
2.I like singing.
3.We go to school every day.
4.They are good friends.
5.He works hard.
6.She likes playing with toys.
7.My mother watches TV every day.
8.You are a beautiful girl.
9.Tom is playing football on the playground.
10.Bill does his homework after supper.
11.They can sing and dance.
【三】:英语肯定句变否定句所有规则21(2)
一、 简单句中含有be动词、情态动词和助动词时，变否定
句时需在be动词、情态动词和助动词后加not。
1. （am, is ,are 是be动词）如： I am a teacher．→I am not a teacher． This is a pen.→ This is not a pen.或This isn’t a pen. (is not =isn’t) You are a boy. →You are not a boy. (are not =aren’t)
2. （can是情态动词） He can help me．→He can not help me．或He can’t help me.(can not =can’t )
3.当主语是第一人称、第二人称和第三人称复数时用助动词do,变否定时，在do后面加not 如：I like English .I do not like English.或I don’t like English.
They go to school together. →They do not (don’t) go to school together.
4.当主语是第三人称单数时用does,变否定时，在does后面加not，如：The little girl wants to go there.→ The little girl does not (doesn't ) want to go there．
2．简单句中谓语动词为行为动词时，要根据时态选用do的相应形式，把肯定句变为否定句。如：
The little girl wants to go there．→The little girl doesn't want to go there．
He did his work yesterday．→ He didn't do his work
yesterday．
3．祈使句变否定句时，一般在句首加Don't，但Let us或Let's开头的祈使句在 Let us或 Let's后加not也可。如： Put them over there．→Don't put them over there． Let us go home．→Let us not go home．
或Don’t let us go home.
4．主从复合句中，主句是I think，I believe等结构，变否定句时，形式上否定主句，实际上否定从句。如：
I don't think chickens can swim ．我认为鸡不会游泳。
5．“had better ＋动词原形”，变否定句时为“had better not ＋动词原形”。如：
You'd better go to school．→ You'd better not go to school．
6．动词不定式变否定式时，常在不定式to前加not。如： The teacher tells me to do it．→ The teacher tells me not to do it．
7．使役动词和感官动词（make，let，hear，see，watch等）后接省略to的不定式，此种不定式变否定句时只需在省略to的动词原形前加not。如：
I saw her work．→I saw her not work．
8．特殊形式的否定句，有以下几种：
（1）肯定句含有every-的合成词时，变否定句时改为no-。如：
Everything is ready．→Nothing is ready．
（2）肯定句中含有always， usually和ever时，变否定句时改为never。如：
He is always late for school．→He is never late for school．www.fz173.com_英语肯定句改否定句。
（3）肯定句含有many，much时，变否定句时分别改为few，little。如：
Many students know him．→Few students know him．
（4）肯定句中含有still时，变否定句时应改为no longer。如：
Tom is still in bed．→Tom is no longer in bed．
（5）肯定句含有both， both．．．and，all时，变否定句时应改为never，neither．．．nor，none。如：
Both of us are students．→Neither of us is a student．
（6）肯定句含有nearly， almost时，变否定句时应改为 hardly。如：
Lily nearly knows him ．→Lily hardly knows him ．
（7）肯定句含有“形容词＋ enough”时，变为否定句时应改为“too ＋形容词的反义词”。如：
He is short enough to reachit．He is too tall to reach it．
（1）谓语动词是be，have（有）或谓语含有助动词、情态动词时，直接在这些词后加上否定词not。如：
She can swim．She can't swim．
（2）谓语动词是行为动词时，要在该动词前加上do ／does ／did not，该词恢复原形。如：
He gets up early．He doesn't get up early．
（3）既要否定谓语动词，又要变换句中的单词。如： He can read and write．He can't read or write．
（4）用含否定意义的词或词组取代肯定句中的某些词或词组。如：
I know both English and Chi- nese．I know neither English nor Chinese．
类似的有：ever ／alwaysnever， somebodynobody，somethingnothing， everybody no one，almost hardly
2．祈使句的肯定式变否定式
（1）一般在动词前加上 don't。如：
Open the window ．Don't open the window．
（2）含有“Let's．．．”的祈使句，一般用“Let'snot．．．”的形式，美国人偶尔也用“Don'tlet's．．．”这一形式。加强语气时使用“Let'sdon't．．．”这一形式。如：
Let's go there．Let's not go there．
3．复合句的肯定式变否定式
一般将主句变为否定式。如：I saw her when I left ．I didn't see her when I left．
肯定句改为否定句的基本方法
把肯定的陈述句改为否定句的基本方法首先要掌握否定句构成的基本规则。
①当陈述句的谓语动词由 be构成时，改为否定句，把not加在be后面。
例1．They are doctors．
这个句子的谓语动词是由系动词构成的，改为否定句时把 not加在are的后面，即：They are not doctors．
例2．He is g oing to see his friend tomorrow．
本句的谓语由is going to see构成，改为否定句时把否定词not加在is后面，即：He is not going to see his friend tomorrow． ②当陈述句的谓语由情态动词can（may，must等）＋其他动词构成，或由助动词will， have，had等十其他动词构成时，改为否定句，用情态动词或助动词十not＋动词的形式表示。
例3．They will go to see their parents this afternoon．
这个句子谓语由助动词 will加动词g o构成，改为否定句时，把not放在will后面，即：They will not（won't） go to see their parents this afternoon．
例4．The train had already left when we got to the station． 这个句子谓语由助动词had加leave的过去分词left构成，改为否定句时要把not加在had后面，同时already改为yet，
【四】:英语肯定句、否定句、一般疑问句和特殊疑问句的讲解与练习
小学英语肯定句、否定句、一般疑问句和特殊疑问句的讲解与练习
二．句子的种类
一、be动词：am, is, are
二、肯定句、否定句、一般疑问句和特殊疑问句定义
1．肯定句：表示肯定的意思, 即不含有否定词“不”。
比如：我是一个学生 I am a student.
他去上学 He goes to school.
2．否定句：表示否定的意思。
比如：我不是一个男孩。 I am not a boy.
他不去上学 He does not go to school.
3. 一般疑问句：回答为“是yes”或者“否no”的问句。
比如：你是一个学生吗？ Are you a student?
你喜欢英语吗？ Do you like English?
4. 特殊疑问句：回答不是“是yes”或者“否no”的问句，根据提问内容具体回答。
比如：现在几点了？ What’s the time?
哪一支笔是你的？ Which is your pen?
三、肯定句、否定句、一般疑问句和特殊疑问句的相互转换
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