--where have you put the box.i can't find it.

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--where have you put the box.i can't find it.
--i put it here.but now it's gone.
这里为什么一个用have put
一个用put

第一个是现在完成时 ,强调动作在过去发生但对现在造成影响,即我找不到.所以用 have + put .
关于现在完成时的知识,请参考：
http://baike.baidu.com/view/191047.htm
第二个是过去时,它只强调 put 这个动作,故用一般过去时put,表示当时我放在这儿.
关于一般过去时的知识,请参考：
http://baike.baidu.com/view/191061.htm

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