He is reading.is是助动词还是联系动词?

He is reading.is是助动词还是联系动词? He is reading.is是助动词还是联系动词? He is reading.is在这里是助动词还是联系动词? He is reading.是主系表结构吗?我在语法书上看到is是助动词 也同时是系动词吗? He is reading a book. 补充句子:He is reading he is always complaining.这里的是is是助动词吗? He is playing basketball中的is是什么成分是助动词吗 be既可以是助动词又可以作系词吗?He is singing（这里be是助动词还是系词？） He used to__in the sun,but now he is used to__at night A.read,read B.reading,read C.read,reading D.reading,reading 正确答案是： He is still reading.变成一般疑问句 He is taking and reading a book. He is reading a book 变成一般将来时 he newspaper you are reading is rubbish is、am、are是助动词吗? he is singing里的is是助动词吗?如果是,那么真正的动词在哪? When he is dressed in white uniform.dress已是一个动词为什么还要用助动词is呢? he is reading when it is raining.对 readinghe is reading when it is raining.对 reading 提问.