"my bed is on the floor "为什么要用“is”啊?

My bed is on the floor 对My提问 my baseball is on the floor,under the bed My baseball is on the floor under the bed.对 on the floor und My sister's dress is on the bed.____is on the floor My classroom is on the ground floor. My flat is on the t____ floor. This is my schoolbag.____(she)is on the bed.用适当的形式填空啊! the,floor,besk,bed,baseball.is.and,the,on,between,the,the(造句 It is on the floor 连词成句is,third,the,my,floor,bedroom,on. My room is on the second floor.改为一般疑问句 tennis is racket floor the on my(连成句子）