1.This is a book.中is的成分?2.谓语动词和谓语有差别吗?

This is a book Is this a book? Yes,this is. This is a book答语 This is s book.(a book提问) [1.This`s 2.this is 3.that]a book. This is a book 改为复数句 This is a interesting book.找错误! this is a book改为复数形式 This a book is good 怎么改错 Is this a book?的复数句 改错题：This is a my book. This is a book变成一般疑问句 this is a nice book的感叹句? This is a nice book,____it?填空 改错This is a expensive book This is a book.(It's,Its) this is a book on ________(electronic) This is a Engilsh book.改病句