初中英语语法1.where does he live?为什么用does 2.how old is his sister

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初中英语语法
1.where does he live?为什么用does
2.how old is his sister 为什么用is不用does?
3.what do you usully have breskfast 为什么用do?

1.因为关于live的短语比如live in ,它没有说是be live in 啊,前面是没有be 动词的,没有现成的动词就只好借用助动词喽,助动词就是在这种情况下用的.
2.可以用句型转换的思想来看这道题.这句话如果改成陈述句就是：His sister is XX years old.同上一题,有现成的be动词,所以不用does.
3.相信第3题你已经会了吧.改成陈述句就是：you usually have breakfast.句子里没有现成的be动词,所以要借助助动词来完成这个句子.而you 是第二人称,所以用do.

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