为什么可以当助动词用呢?这里is既是助动词又是系动词?
追答不是助动词,但可以象助动词一样充当否定(加not)、疑问(提前到主语前)
如:
He is a student.
He isn't a student.
Is he a student?
She has a brother.
She hasn't a brother.
She doesn't have a brother.
Has she a brother?
=Does she have a brother?
(have“有”时,可以直接加not,也可以用do,does来做助动词。
部分倒装不是把助动词提前吗?
看我问题是啥