I have no idea which to buy.这里的which引导的是同位语从句吧?为什么书上说which不可以引导同位语从句?

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Ihavenoideawhichtobuy.这里的which引导的是同位语从句吧?为什么书上说which不可以引导同位语从句?Ihavenoideawhichtobuy.这里的which引导的是同位语

I have no idea which to buy.这里的which引导的是同位语从句吧?为什么书上说which不可以引导同位语从句?
I have no idea which to buy.这里的which引导的是同位语从句吧?为什么书上说which不可以引导同位语从句?

I have no idea which to buy.这里的which引导的是同位语从句吧?为什么书上说which不可以引导同位语从句?
本身which to buy 不是从句.而且这里如果用 I have no idea which I should buy.后半句就是同位语从句了.
which不可引导陈述性的同位语从句,如:He knew the fact that he was fired.其中that不可换为which.
但疑问性的可以用很多疑问词引导.如:The question who should do the work requires consideration.
包括which 如:They are facing the problem which one they should choose.
如果是一般疑问句,只用whether,不用if.

I have no idea which to buy.
have no idea 等于don't know,所以这里可以把which to buy看做是动词不定式的特殊形式做宾语。

你应该说I have no idea what to buy~~~

句意:我不知道买哪个?
which•••在这里是名词性从句,做宾语。