"this is a book" a book是宾语还是表语?"this is a book" a book是宾语还是表语?二者怎么区分?

This is a book Is this a book? Yes,this is. This is s book.(a book提问) This is a book答语 This is a book ( )and book is new A.an B.a C.the D./ This is a b------- book than the first one. is this your book?yes,() A.this is B.it isis this your book?yes,()A.this is B.it is C.it isn't Whose book is this?It's_____.A.mine BWhose book is this? It's_____.A.mine B.heC.she this book is 20 yuan .that book is 30yuan .so that book is ___ than this book .A.expensive B.more expensive C.most expensive This is a book.对a book进行提问 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?