這兩個詞不引導(dǎo)原因狀語從句.而下面這幾個才引導(dǎo) because,as,since ,now that問錯了，我想問關(guān)系詞前有the reason時什么情況下不用why而用which或that，是不是the reason在定語從句中不作原因狀語時用which或that，能不能舉個句中有the reason用which的例子當(dāng)the reason這個先行詞在定語從句中作原因狀語時用why引導(dǎo)。判斷作狀語可以按照這個方法，即把the reason放在從句中去如果需要在前加上介詞for就說明是狀語。如 The reason why he came late is that he was caught in traffic jam.（the reason作從句中動詞came的狀語即句相當(dāng)于 he came late for the reason所以用關(guān)系副詞引導(dǎo)）當(dāng)the reason在從句中作主語，賓語時用關(guān)系代詞which ,/that引導(dǎo)，如The reason that/which he told us is acceptable.(the reason作從句中動詞tell的賓語所以用關(guān)系代詞)