we live on the third floor,为什么不用live in

we live on the third floor,为什么不用live in they live on the third floor Mr.Green live on (the third )floor.( )内提问 We live on the _____(4) floor. They live on the second floor,and we live on the first floor I live on the third floor.on the third floor是什么成分?是地点状语还是宾语? Where d____ your friend live?He lives on the third floor. I live on floor with my mother.(thied three the third ）怎么选择 i live on the () floor in this building.(two) My father live in Nanjing.I live on the second floor of this which floor do you_____?A.live B.live in C.live on 选C,请问为什么不 I live on the second floor.