问题标题：
why在定语从句中做原因状语时,可不可一换成that?
问题描述：
why在定语从句中做原因状语时,可不可一换成that?
姜家吉回答：
why在定语从句中做原因状语时,不能换成that
请看下面我给你分析的两个句子,想必看完之后,你就会对why引导的原因状语从句的应用有一个彻底的掌握的
句①Hewantedtoknowthereason.
句②Iwaslateforthereason.
把句②变为句①的定语从句,句①中的thereasons做定语从句的先行词.因为thereason做介词for的宾语,先行词是thereason指物,在定语从句中介词for提前,用关系代词which替代thereason,thereason就不能在定语从句中出现了.由此得到句③HewantedtoknowthereasonforwhichIwaslate.
注意：在定语从句中当先行词为thereason(s),定语从句由forwhich引导时,可以用why代替forwhich.由此我们得到句⑤HewantedtoknowthereasonwhyIwaslate.
请把下面两句话合并为一句,把第二句话变为第一句的定语从句.
Thereasonisnotveryconvincing.
Hecameforthereason.
→Thereasonwhyhecameisnotveryconvincing.
Thereasonforwhichhecameisnotveryconvincing.
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