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问题: reason后面什么时候用why什么时候不用

解答:

你问的是定语从句的问题,请看下面的例句:

I don't know the reason why he was late for school this morning.
This is the reason (that) he gave me for being late.

因此,最重要的是要看先行词在定语从句中所做的成分.在第一句中,由于先行词在定语从句中做原因状语,因此要用why,而在第二句中,由于先行词在定语从句中做宾语,因此可以用 that/which/不填.