I have no idea that you were here.和I had no idea that you are here有甚么区别?

问题描述:

I have no idea that you were here.和I had no idea that you are here有甚么区别?

一个是过去式一个是现在时

主要区别是说话人表达的时间有差异.
第一句是说话时不知道对方已经在此.
第二句是说话之前某个时候不知道你现在在此.