be used as \be used for\be used by 的区别

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be used as \be used for\be used by 的区别
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be used as \be used for\be used by 的区别
be used as \be used for\be used by 的区别

be used as \be used for\be used by 的区别
be used by,被.使用.如:
This knife is used by me.
be used for,被用来做什么事情.如:
This knife is used for cutting fruit.
be used as,被用来做什么东西.如:
This knife is used as a tool.