为什么On the floor is a dog and a cat 和A dog and a cat are on the floor 动词不同

A cinema is on the second floor The floor above the ground floor is the first floor.为什么不用on 用above the dog is eating a bone on the floor of the room语法对吗?为什么 为什么On the floor is a dog and a cat 和A dog and a cat are on the floor 动词不同 There is a leaf on the floor.[改为负数句子】 There ______some_______on the floor There is a TV on the (two)floor.填空 There is a chair on the floor.的反义句 there is a postcard(l )on the floor On the g__ floor ,there is a big hall. There is a pet shop on the (three) floor is there a study on the second floor? A football is ( ).A.under the floor B.under the desk on the floor C.on the floor on the desk Your pen is __________.A.under the chair on the floor B.on the floor under the chair急 （）room is on the third floor and （）is on the fifth floor.A.theirs；ourB.their；ours （）room is on the third floor and （）is on the fifth floor.A.theirs；ourB.their；ours The canteen is the first floor.A.onThe canteen is the first floor.A.on B.at C.in填空 there is (a soccer ball and a basketball) on the floor.括号提问_____ _____ _____ on the floor Don't litter the floor为什么 the floor前不加on?