why在定語從句中做原因狀語時,不能換成that
請看下面我給你分析的兩個句子,想必看完之后,你就會對why引導(dǎo)的原因狀語從句的應(yīng)用有一個徹底的掌握的
句①He wanted to know the reason.
句②I was late for the reason.
把句②變?yōu)榫洧俚亩ㄕZ從句,句①中的the reasons做定語從句的先行詞.因為the reason做介詞for的賓語,先行詞是the reason指物,在定語從句中介詞for提前,用關(guān)系代詞which替代the reason,the reason就不能在定語從句中出現(xiàn)了.由此得到句③He wanted to know the reason for which I was late.
注意：在定語從句中當(dāng)先行詞為the reason(s),定語從句由for which引導(dǎo)時,可以用why代替for which.由此我們得到句⑤He wanted to know the reason why I was late.
請把下面兩句話合并為一句,把第二句話變?yōu)榈谝痪涞亩ㄕZ從句.
The reason is not very convincing.
He came for the reason.
→The reason why he came is not very convincing.
The reason for which he came is not very convincing.