I sometimes clean blackboard to my teacher.he often clean blackboard for me.为啥一个用to 一个用fo

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I sometimes clean blackboard to my teacher.he often clean blackboard for me.为啥一个用to 一个用fo

I sometimes clean blackboard to my teacher.he often clean blackboard for me.为啥一个用to 一个用fo
I sometimes clean blackboard to my teacher.he often clean blackboard for me.为啥一个用to 一个用fo

I sometimes clean blackboard to my teacher.he often clean blackboard for me.为啥一个用to 一个用fo
前一个to是从属关系,表示谁的什么,比如,the key to the door 这个门的钥匙.后一个是"为"的意思,他经常为我擦黑板.