定语从句中什么时候用for which代替why

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定语从句中什么时候用for which代替why

定语从句中什么时候用for which代替why
定语从句中什么时候用for which代替why

定语从句中什么时候用for which代替why
非限制性定语从句不能用why引导.要用for which代替why.
如:
 1. I had told them the reason, for which I didn't attend the meeting. 我已经把理由告诉了他们,为此我没有去开会.
  2. I had told them the reason why I didn't attend the meeting. 我告诉了他们我不去开会的理由.(限制性定语从句“the reason why...”是常见搭配.)
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这个没有固定的,我只知道有时for 等介词在从句里时不用why而用which,如........which.........for中.....for就是从句,它是将for which 中的for提到了后面,这类倒要注意