育才学习网1.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。 我们教室里有四个风扇。
二.否定句：含有否定词或表示否定意义词的句子。 例： This is not my pen。
这不是我的笔。 He does not (doesn't) work in a hospital。
他不在医院工作。 There are not (aren't) four fans in our classroom。
我们教室没有四个风扇。 三.肯定变否定，有以下2种情况 1.有am / is / are，就在它们后面加 not。
am → am not is → is not are → are not 比如： I am a girl。→ I am not a girl。
我是女孩。→我不是女孩。
2.没有 am / is /are， 但有表示动作的动词（比如eat），就在动词前加 don't 或 doesn't， 动词为原形。 V原→ don't + V原 V(-s, -es结尾) → doesn't + V原 eat → don't eat eats → doesn't eat 比如： I drink cola。
→I don't drink cola。 我喝可乐。
→我不喝可乐。 She drinks cola。
→ She doesn't drink cola。 她喝可乐。
→她不喝可乐。 扩展资料 一.否定句主要是在肯定句的基础上加上了否定词 “not”。
二.有动词be的句子则“not”加在be后面，可缩写成“isn't,aren't”，但am not 一般都分开写。 三.没有动词be的句子则要先在主要动词的前面加上一个助动词（do,does,did），然后在它后面加上“not”，你也可以把它们缩写在一起如“don't , doesn't , didn't ）。
四.上面三个助动词要根据人称和时态来选择，其中“does”只用于一般现在时主语是第三人称单数的情况，而“did”只用于一般过去时，不论主语是什么人称和数，都用“did” 。
2.“肯定句（英语）怎样写”
一.肯定句变成否定句
如果句中有be动词is,am,are 或情态动词must,can等，在其后面直接加not,
she is your mother. she isn't your mother
2.如果没有be动词或情态动词，加don't,does't或did't
she likes playing football. she doesn't like playing football.
二.肯定句变成疑问句
变成一般疑问句
如果有be或情态动词动词就把他们提前，
she is your mother. Is she your mother?
2.如果没有就在前面加do的某种形式，第三人称用does，过去时用did
she likes playing football. Does she like playing football?
变成特殊疑问句，
要具体分析，看是对什么进行提问，简单来说，
1.对人提问用who, she is your sister.Who is your sister?
2.对事物用what, The book is on the desk. what it is on the desk?
3对时间用when, She will come back tomorrow. When she will come back?
4.对频率用how often等等 I play football everyday. How often does you play footall?
3.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 /alwaysnever, somebodynobody,somethingnothing, 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.。
4.英语的肯定句怎么改成否定句
肯定句改为否定句 【正文快照】： 一、若句中有be动词、情态动词或助动词时，则分别在它们的后面加上not。
例如：1.Heisateacher.→Heisnotateacher.2.Icanfindthebag.→Ican'tfindthebag.3.Iwillgotomyhometownnextweek.→Iwillnotgotomyhometownnextweek.4.Theyhavealreadyfinishedit.→Theyhavenotfinishedityet.二、若句中谓语动词为原形、第三人称单数或过去式，则应在谓语动词之前加上donot(don't)熏doesnot穴doesn't雪熏didnot穴didn't雪熏并将原谓语动词变为原形。例如：1.Igotoschoolonfooteveryday.→Idon' tgotoschoolonfooteveryday.2.Hehaslunchatschool.… Turn(T,u,r,n)off the tv这句改为否定句don't turn off the TV We are going to go fishing tomorrow，要求根据go fishing来提问。
改为： What are you going to do tomorrow？（这不是改为什么祈使句、而是就划线部分提问、就是改为特殊疑问句、） 否定句就是有否定词、表达否定、祈使句是表示请求‘、命令、号召等句子、谓语动词用原型、比如：come in。