what his father left him are only some books这句中为什么用are what

提问there are some books and pens 为什么用（what are there/what is） The students are reading some story books.用What are the stud 为什么There are some books on the table.的特殊疑问句是What is there on what is on the desk?There are some books为什么是对的? what'er__________(在书包里）?There are some books. books.what.made.are.of what are books made of What are {this}?They are English books What are those?________(those)are books. some of his books are very exciting 改句子：what are in the box?---There are some books.(改一处） —————— in the box?there are some books what's 还是what are the