reason的定语从句什么时候用why什么时候用其他的求举例

reason的定语从句什么时候用why什么时候用其他的求举例
reason的定语从句什么时候用why什么时候用其他的
求举例

reason的定语从句什么时候用why什么时候用其他的求举例
reason在定语从句中的用法 The reason why...is that...这是特定句型,why引导定语从句,is后的用词为that,一般不用because.
The reason why she did it is that she wouldn’t let her parents feel disappointed.
她为什么做那件事是因为她不想让父母失望.
该句中的why引导一个定语从句,而that引导表语从句.
(1) 句中that引导的表语从句说明主语reason的具体内容
注意以下三种结构：
① The reason is / was that clause.当主语是reason / cause时,一般不能用because或why引导表语从句,以免造成语意重复.
The reason why/for which(也可以省去) he was late was that he got up late.
他迟到的原因是他起床晚了.
②当主语是This / That时,可以由because / why引导表语从句.
He got up late.That was why he was late for class.
He was late for class.That was because He got up late.
(2)why在句中是关系副词,引导定语从句,修饰先行词reason,同时它在定语从句中作状语,此时why = for which,但要注意：关系词在定语从句中做主语或宾语时,要用关系代词that或which.
The reason why/for which(也可以省去) he was late was that he got up late.
他迟到的原因是他起床晚了.
The reason that/which/(也可以省去) he gave you was reasonable.
他给你的理由是合理的.