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is和do的区别每次我做英语作业提疑问句,我总是不知道改用is开头还是do开头,这个该怎么区别呀

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/15 12:44:51
is和do的区别
每次我做英语作业提疑问句,我总是不知道改用is开头还是do开头,这个该怎么区别呀
is是be动词.
be动词包括:am ,is ,are.
如果把一个句子变成疑问句,首先要看这个句子的动词是什么.
如果句中有be动词,直接把be动词提前.
例如:
This is a pen.有be动词,直接提前,就是Is this a pen?
They are eating apples.Are they eating apples?
如果句中没有be动词,而是实意动词,就得借助于助动词do 或 does 提问.
例如:
They had an oral english class yesterday.
had 是实意动词.借助助动词提问:Did they have an oral english class yesterday?
had 是过去式,所以用did 提问.变为疑问句的时候动词had 要还原为have.
He goes to school by bus everyday.go 是实意动词,就得借助助动词does提问.变为:Does he go to school by bus everyday?
he 是第三人称单数,所以用does 提问,疑问句中goes还原为go