I've already had lunch过去完成时,这句短语中请问怎么运用理解啊?

I've already had lunch过去完成时,这句短语中请问怎么运用理解啊? i've already had lunch中ve指的是什么? I've already had lunch.Have you had lunch yet?这是什么时态呢? I have had lunch.怎么变成过去完成时 We're having lunch I'VE already had lunch I had lunch at hal I've already had lunch.Have you had lunch yet?这是新概念二第4课的课后练习 在新概念第一册83课中提到了现在完成时!课文上写的是I've already had lunch.I had lunch 我已经吃过饭了为什么是【I’ve already had lunch】?I’ve用在这里好难理解. I have already had lunch.改为否定句. I've already had a sleep改为否定句 I`m hungry.but you`ve just had lunch.you▁hungry already.A.wo I have already had lunch 是什么结构