This is a book
This is a book
Is this a book?" "Yes,this is."
This is s book.(a book提问)
this is a book 提问
This is a interesting book
This is (a math) book.
This is a book (对a
This is a book.对a book进行提问
"this is a book" a book是宾语还是表语?
如何回答:Is this a math book ?
This book is a favorite with students
This is a Engilsh book.改病句