Are there any birds in the tree?为什么不能写为Is there any bird in

都对!
纠结什么?你会同时说两种?
再问： there's a map of the world in our classroom ,but there aren't any pictures on our walls.这里的but there aren't any pictures也可以改为but there isn't any picture吗？
再答： 当然可以！！
或者：
There is no picture on the wall.
There are no pictures on the wall.