There is a desk in the classroom对desk提问,为什么不用what is there in the classroom（教室里有什么）?而要用what is in the classroom（教室里是什么）?

Is there a book in the desk? There is a desk in his bedroom.On--desk there is--pencil-box.填冠词 选词填空[aren't are is are isn't ][ ]there a desk in your room?there[ ]a pen,but there is a pencilhow many rivers[ ]there?[ ]there any mountains?there[ ]many trees.there is only one. There is a new t------ ------under the desk there is a desk in the room ｛改为否定句｝ There is only a desk in the classroom there is a desk in the classroom.怎么提问 There is a desk in room.I often_______________in my room. Is there a maths book in your desk 怎样回答 a；is；in；them；there；of；desk；front；big there is a book in the desk 怎么改错 There is a teacher desk in our classroom.改错 there is only a desk in the classroom 转换为there is 空 in the classroom 空 a desk 英语同义句转换①There is a desk in the classroom①There is a desk in the classroom②He has a desk in the room 选择.1:There is ( )apple in the bag.A:a,B:an.C:the.2:There ( )some books on the desk.A:are.B:is.C:am.3:Is there a flower?Yes,( )A:there is.B:there isn't.C:it isn't.4:There are many ( )in the river.A:fish.B:fish's.C:fishs.5:Are there ( )bridges in y ____ there a bed,a desk and a big closet in your bedroom? YES,there is. ( ) a desk in my bedroom A.There is B.There are C.It 如何使用there is和there are比如说：there( )a desk in the classroom.there ( ) no ink in my pen.