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.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 running是主系表结构吗 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 He is in the Reading Club.He is _____ _____ _____the Reading Club .(同义句转换) he is reading his newspaper now ( 对这三个单词提问reading his newspaper) reading he is reading when it is raining.对 readinghe is reading when it is raining.对 reading 提问. 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 in the Reading Club.(改为同义句) He is___ ____ ____the Reading Club. He r-----likes reading .He is a member of the reading club. There he is.是什么结构? Who is the student___in the library.A.who B.that reading C.reading D.he is reading I am reading是主系表结构还是主谓宾结构?为什么?