英语肯定句变否定句所有规则

1、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 teacherI am not a teacher This is a pen. This is not a pen.或This isnt a pen. (is not =isnt) You are a boy. You are not a boy. (are not =arent)2. （can是情态动词） He can help meHe can not help me或He cant help me.(can not =cant ) 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 dont like English. They go to school together. They do not (dont) go to school together.4.当主语是第三人称单数时用does,变

2、否定时，在does后面加not，如：The little girl wants to go there. The little girl does not (doesnt ) 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 thereThe little girl doesnt want to go there He did his work yesterday He didnt do his work yesterday 3祈使句变否定句时，一般在句首加Dont，但Let us或Lets开头的祈使句在 Let us或 Lets后加not也可。如： Put them over thereDont put them over there Let us go homeLet us not go home或Dont 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 d

3、ont 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： Youd better go to school Youd 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 workI 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 readyNothing 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

4、 schoolHe is never late for school （3）肯定句含有many，much时，变否定句时分别改为few，little。如： Many students know himFew 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 bedTom is no longer in bed （5）肯定句含有both， bothand，all时，变否定句时应改为never，neithernor，none。如： Both of us are studentsNeither 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 reachitHe is too tall to reach i

5、t （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 swimShe cant 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 earlyHe doesnt 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 writeHe cant 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- neseI 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 dont。如： Open the window Dont open the window （2）含有“Let

6、s”的祈使句，一般用“Letsnot”的形式，美国人偶尔也用“Dontlets”这一形式。加强语气时使用“Letsdont”这一形式。如： Lets go thereLets 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 didnt 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。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1They 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2He 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当陈述句的谓语由情态动词can（may，must等）其他动词构成，或由

7、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3They 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（wont） go to see their parents this afternoon例4The 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，即： The train had not left yet when we got to the station例5Linda can speak Chinese well本句的谓语由canspeak构成，把它改为否定句时，在can后面加not，即：Linda can not speak Chinese well例6We have alrea

8、dy learned English for two years本句的谓语由havelearned构成，把它改为否定句时，要在助动词have后面加not，把句中的already改为yet，即：We have not learned English for two years yet当陈述句的谓语动词是have，表示有什么，改为否定句的方法是：（A）由have not其他；（B）由have十no十其他；（C）由 dont（doesnt，didnt）have十其他，如果句中有some，要将some改为any。例7You have some books这个句子谓语动词have当“有”讲，在改为否定句时要把not放在have后，并把some改为any，即：You have not any books这个句子也可以改写为在have后加no即：You have no books这个句子还可以改写为：You dont have any books当陈述句的谓语由have十其他词构成，这时have不当“有”讲，也不是“助动词”，改为否定句时，由助动词do（does，did） nothave构成否定结构

9、。例8They often have breakfast at seven in the morning本句的谓语动词是have，而have breakfast的意思是“吃早饭”，把它改为否定句，要由助动词donothave breakfast构成否定形式，即：They dont have breakfast at seven in the morning例9He had a meeting yesterday afternoon本句谓语动词hadmeeting的意思是“开会”，是一般过去时，改为否定句时由did nothave a meeting构成否定形式，即：He didnt have a meeting yesterday afternoon以上两个例句说明改成否定句时，千万不要盲目把否定词加在have（has，had）后面。如果是由has或had 其他词构成的谓语改为否定句时，加上（does，did）not后要注意把has，had改为原形have。陈述句的谓语动词是行为动词，改为否定句时，要用助动词do（does，did）not行为动词构成否定形式。例10He studies English well本句的谓语由行为动词studies构成，把它改为否定句时要由助动词doesnot构成否定形式，即：He doesnt study English well例11Her brother

《英语肯定句变否定句所有规则》由会员壹****1分享，可在线阅读，更多相关《英语肯定句变否定句所有规则》请在金锄头文库上搜索。