The boy is hiding__a tree.(on,behind)为什么不能用on?

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The boy is hiding__a tree.(on,behind)为什么不能用on?
1.The boy is hiding ___ (on,behind) a tree.为什么不能用on?
2.There is a garden ___ (behind,between) the house.为什么不能用between?
3.Look!The children are ___ (across,on) the bridge.为什么不能用across?
4.There is a box ___ (over,on)the table.为什么不能用over?
5.There are two policemen ___ (before,in front of) that building.为什么不能用before?
请分别作答.

1 on a tree指水果,树叶长在树表面的东西.
2.between是指两者之间,这里就一座房子.
3.across表示动作必须和动词搭配,比如：drive across/run across
4.over表示不接触的上方,上空.
5.指位置的前面用in front of,但指时间需用before,和某人的面前可以用before
再问：你好，后四个都明白了，就第一个还不太清楚，能否解释清楚一点，on a tree怎么就变成指水果了？tree不是树吗？ tree [tri:] 基本翻译 n. 树；木料；树状物 vt. 把...赶上树 vi. 爬上树；逃上树换成 on 这句的解释不是“男孩躲在一颗树上”吗？
再答： hiding behind the tree 是藏在树后面。如果选on, 也不能表示藏在树上，因为要用in the tree. on the tree只能指树上（表面）的东西，比如树叶，树上结的果子。比如：There are many apples on the tree. 如果是男孩躲在树上（树里面),不能用on，要用in.

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