英语中，什么情况下用has什么情况下用have

Question

如题所述

Answer 1

have与has都是“有”的意思,但二者用法是有区别的.
在陈述句中,当主语是单数第三人称（he、she、it）时,句子的谓语是“有”时,用has；当主语是其他人称（I、you、we、they）时,句子的谓语是“有”时,用have. 例句：I \ You have an apple . We\They have some apples . He\She has a pen .
但是,在疑问句中,当主语是就单数第三人称提问或否定句时用助动词does 和does not (doesn't),然后把has 变成have 如果不是第三人称,助动词就是do ,否定式do not (don't).特殊疑问句回答照样,该是has 还是has 该是have 还是have 但是当一般疑问句 以do或does开头的时候,只能回答 do dont 或者 does doesn't 例句：
Do you have a book yes ,I do /No ,I don't What does a cat have the cat has a , He doesnt have any coffee.
就是第二种：have本身也可以作为助动词,(作为完成时里的助动词)本身无词义,和do 一样,has 就相当于does 在单三情况下用,主要用于构成各种时态、语态、语气以及否定和疑问结构.（那此时的have还是has就要看具体的人称而定）完成时态是have/had + done (过去分词的形式)
I have finished my work,she has finished her work
have you finished your work?has she finished her work?在一般疑问句里回答直接用have/has yes,i have/ No ,i haven't Yes,she has/ No,she hasn't(因为这里have/has是助动词) have 是动词原形i have,we have,you have,they have,to have... has 是第三人称单数时用 he has,she has,it has
have用于第一人称（I,we),第二人称(you),及第三人称复数（they）；has用于第三人称单数（he,she,it)或单数名词.

Answer 2

看主语是单数还是复数
单数用has,复数是have

Answer 3

ave和has在用于英语表达动词“有”的含义时,前者使用于第一人称、第二人称和各人称复数,has用于第三人称单数,同时它们也作为完成时态的助动词存在,其用法和做实义动词“有”的规则也是一样的.
助动词have的用法
1）have +过去分词,构成完成时态,例如：
He has left for London.他已去了伦敦.
By the end of last month,they had finished half of their work.
上月未为止,他们已经完成工作的一半.
2）have + been +现在分词,构成完成进行时,例如：
I have been studying English for ten years.
我一直在学英语,已达十年之久.
3）have+been +过去分词,构成完成式被动语态,例如：
English has been taught in China for many years.中国教英语已经多年.
动词have/has表示"有"时,它通常有三个含义:
A.表示"某人(在物质上的)所有."这种情况下不能用there be替换.如:
I have a new watch.我有一块新表.
He has a good friend.他有一个好朋友.
B.表示"某人或动物(在身体上的)长有".这种情况也不能用there be替换.
如:
She has blue eyes.她的眼睛是蓝色的.
A horse has two ears.马有两只耳朵.
C.表示"某物体(在结构上的)装有".这种情况可以用there be替换.如:
A clock has a round face.= There is a round face on a clock.
钟上装有一个圆型的钟盘.
That room has only two windows.= There are two windows in that room.
那个房间仅装有两扇窗户.
The school has 14 classes.= There are 14 classes in the school.
那个学校有14个班级.
D.另外,表示"某人手中有某物"时,也用have/has.例如:
Mary has a glass of water in her hand.玛丽手中端着一玻璃杯水.