There is a bird in the tree.为什么用In.能不能用on.

There is a bird in the tree.为什么用In.能不能用on. There is a bird on the tree.on the tree or in the tree There is a bird ( ) the tree.是用on 还是用in there is not a bird in the tree为什么用not In the tree there is a bird .可以改为:There is a bird in the tre There is a little bird in the tree.There are many pears on t There is a beautiful bird ______ the tree. （ A ） A、in B、on C There is a bird ( ) the tree.A.at B.on C.in D.above is there a bird（ ）the tree?括号里填in还是on? There is a bird in the tree 改为一般过去式 连词成句:is,there,bird,a,the,in,tree. there is a bird in the tree变为复数形式