I have no idea 后能否用that引导同位语从句 若能 请举个例子

I have no idea 后能否用that引导同位语从句 若能 请举个例子 HOW 能否引导同位语从句 例：You have no idea how depressed you have made i have no idea后到底接的是同位语从句还是宾语从句 同位语从句只用that作为开头（I have no idea除外） 为何 which 可以引导同位语从句吗?I have no idea which one I should choose?是什 that/which能引导先行词是reason的定语从句么?如果有,能否举个例子? 先行词是time,用that/which引导一个定语从句,能举个例子么 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 什么是同位语从句?举个例子说明下了 同位语 举个例子 I have no idea where he comes from是同位语从句? I have no idea what has happened to him为什么是同位语从句