关于主系表结构表语是否一定要是形容词?This is a book是不是主系表结构?The book is import

关于主系表结构表语是否一定要是形容词?This is a book是不是主系表结构?The book is import "this is a book" a book是宾语还是表语? this book is on the desk 句子结构分析 this is a new book 其中的表语是book还是a new book This is a book This is s book.(a book提问) this is a book 提问 This is a interesting book This is (a math) book. Is this a book?" "Yes,this is." 关于英语倍数问题this book is 3 times what you bought 是否等于 the price This is a book ( )and book is new A.an B.a C.the D./