英语肯定句定义

否定句里有：not,或者其他否定词，您可以搜一下英语有哪些否定词

如果句中有be动词is,am,are ,were,was或情态动词must,can等,在其后面直接加not,she is your mother. she isn't your mother2.如果没有be动词或情态动词,加don't,does't或did'tshe 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didshe 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?

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?

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” 。