英语中否定句怎么写 _英语

1.英语的否定句怎么写1. 简单句中含有系动词be、情态动词和助动词时，变否定句时需在系动词be、情态动词和助动词后加not 。
如： I am a teacher.→I am not a teacher. He can help me.→He can't help me. 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即可。
如： Put them over there.→Don't put them over there. Let us go home.→Let us not 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. (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. (8)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. (9)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. (10)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. (11)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 /alwaysnever, somebodynobody,somethingnothing, everybody no one,almost hardly 9.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. 10.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. 。
2.英语的否定句和肯定句怎么写一.肯定句：是指用肯定的语气来陈述的句子。
例：
This is my pen 。
这是我的笔。
He works in a hospital 。
他在医院工作。
There are four fans in our classroom 。