Listen!Many birds are singing()the tree 填什么介词

in 外来物用in,本身所长用on
其实二者很多时候可以互换,外国人经常是混用的.但是在中国的考试中,会特意考到二者的区别.
非要说它们的区别的话,可以见以下解释：
in the tree通常表示的是方位、位置,在树上、在树干上、在树枝间等都用in the tree表示.
例句：
Alan found a bird's nest in the tree.艾伦发现树上有个鸟窝.
The bird took refuge from the cat in the tree.那只鸟飞到树上,躲开了猫.
The woodpecker pecked a hole in the tree.啄木鸟把树啄了一个洞.
The monkey was swinging in the tree.猴子在树上荡来荡去.
on the tree也可以当成in the tree来用,此外还专门特指生长在树上.如树上结的果子、开的花等等.
例句：
The apples rotted on the tree.苹果在树上就烂了.
A few flowers still remained on the tree.树上还剩几朵花