文档介绍：do和does的用法
do 这个词(does是第三人称单数形式),大体上从两方面来讲。
,跟其他动词一样,如study, play等。他的意思是“做”等。如:
We usually do our homework in the afternoon.
He does his homework in the evening.
,也就是帮助主要动词构成否定和疑问等。
We don't like bananas.
Do you like apples?
Does he like English?
He doesn't like swimming.
上面有一句He does his homework in the :
He doesn't do his homework in the evening.
这里加上了助动词doesn't,而原来的主动词does变成原形do了。
作为助动词的do和does是没有词义的,它们在句中的构成一般现在时的疑问句和否定句.
Do用于主语第一人称,第二人称和第三人称复数形式的句中,does用于主语第三人称单数的句中。
Eg. Do you want to be a teacher? 你想成为一个老师吗?
Do his friends go to park every day? 他的朋友们每天都去公园吗?
I don’t like him. 我不喜欢他。
Where does e from? 汤姆来自哪里?
I don’t 。
He doesn’t live here. 他不住在这儿。
will/can/could/would/should/shall 等助动词后面加be
其他时候, 第一人称I后面用am
第二人称, 复数, 用are
单数用is...
1、名词
A)、名词的数
我们知道名词可以分为可数名词和不可数名词,而不可数名词它没有复数形式,但可数名词却有单数和复数之分,复数的构成如下:
一)在后面加s。如:fathers, books, Americans, Germans, apples, bananas
二)x, sh, ch, s, tch后加es。如:boxes, glasses, dresses, watches, wishes, faxes
三)1)以辅音字母加y结尾的变y为i再加es 如:baby-babies, family-families, duty-duties, edies, documentary-documentaries, story-stories
2)以元音字母加y结尾的直接加s。如:day-days, boy-boys, toy-toys, key-keys, ways
四)以o结尾加s(外来词)。如:radios, photos, 但如是辅音加o的加es:如: tomatoes西红柿, potatoes马铃薯
五)以f或fe结尾的变f为v再加es(s)。如:knife-knives, wife-wives, half-halves, shelf-shelves, leaf-leaves, yourself-yourselves