She wants to be a policewoman.( want后为什么加S )

来源：学生作业帮助网编辑：作业帮时间：2024/05/04 08:43:11

She wants to be a policewoman.( want后为什么加S )
She wants to be a policewoman.( want后为什么加S )

She wants to be a policewoman.( want后为什么加S )
因为She是单三.
在一般现在时中,动词根据主语的不同,有单复数的变化.
主语第一、第二人称和第三人称的复数,实义动词用原形,be动词根据主语不同而变化.
主语是第三人称单数,实义动词要变单数,后面加s或es,be动词用is. 这个用法称为第三人称单数.
如果要变复数,动词变回原形,be动词根据人称而变化.
动词在一般现在时的形式：
一、 Be 动词的一般现在时
Be动词要根据句中主语的人称和数而变化.它有三种形式：am is are.例如：
1． I am a student．
2． Is your father a worker? Yes he is．
3． They are in the classroom．
4． This is an apple．
5． Where are my books?
6． We are friends．
以上句子是主系表结构,be 称为连系动词,它后面是表语,表语可以由名词、形容词、介词短语等充当.is 跟单数主语,are跟复数主语.
二、实义动词的一般现在时
一个动作经常反复地发生,就用一般现在时.第三人称单数作主语,谓语动词要加〃s〃或〃es〃,这种动词形式简称为单三动,中文里没有这种概念,最初学习很容易错,记住：单三人称单三动,其它人称用原型.
例如：1． He works in the factory．
He doesn’t work on Saturday and Sunday．
2． —Do you like football?
—Yes I do． But I don’t often play．
I like basketball．

一般现在时 she是单数第三人称所以加s

第三人称单数，后面动词加s/es

一般现在时的时态下，第三人称单数后的动词要加s

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