My books are on the shelf. 为什么BOOK+S?

my books are on the table. 对my books 提问.? my books are on the desk. on是谓语动词? My books are on the table.（变否定句） My books _______ on the table. my books are on the desk. 可以不用are 吗? my video tapes are on the books?on the books 划线 对划线部分提问 My books are on the desk,dut ( ) books are under the chair. My books are on the shelf. 为什么BOOK+S? My books are on the table(改为一般疑问句） My books are on the bookcase.改成一般疑问句 bed,are,my,books,English,the,on连词成句 my books are on the bed怎么改为否定句 My books are on the shelf 为什么要加 are?My books on the shelf不对吗? (my) books are on the books.分别对两个括号提问 My English books are on the b▁▁▁ ,my books are all in it.如题. My keys are on the sofa.对on the sofa 提问?是用where are my books 还是用where are your books These are my sketch-books.They are on the desk.怎么样两句并一句? ------are my shoes? ------books are there on the table ------your best friend 单词拼写where are the books?they are on my f____