there is not a bird in the tree为什么用not

there is not a bird in the tree为什么用not There is a bird in the tree.为什么用In.能不能用on. is/there/not/a/the/garden/in/tree/. In the tree there is a bird .可以改为:There is a bird in the tre 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 There is a bird on the tree.on the tree or in the tree 树上没有鸟There are not birds in the tree.还是There aren't any bird The bird is in the tree.()you see it?-A.can not B.can't C.do There is a bird in the tree. 对 a bird 划线提问 There is a bird ( ) the tree.是用on 还是用in