there is no reason why you should't tell them in advance what you are going to do.他做什么句法成分

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there is no reason why you should't tell them in advance what you are going to do.他做什么句法成分

there is no reason why you should't tell them in advance what you are going to do.他做什么句法成分
there is no reason why you should't tell them in advance what you are going to do.他
做什么句法成分

there is no reason why you should't tell them in advance what you are going to do.他做什么句法成分
你没有理由不事先告诉他们你要做的事情.
why 为关系副词 ,引导定语从句,修饰reason 的 .
句型很简单 就是个there be 句型 ,然后主语被定语从句修饰,而定语从句里又有个what 引导的名词性从句 .
够清楚了么

there is no reason why...是个固定结构,表示无任何理由,毫无疑问的意思。
谢谢采纳!

why是为什么,引导定语从句修饰限定reason.