I’ve lived here for twenty years.

问题描述:

I’ve lived here for twenty years.
have后面为什么不用加 already
I’ve had lunch.这句话对吗

加already多余了,现在完成时本来就表示“已经完成”.
补充的问题应该是正确的.前一个have是情态动词,后一个是行为动词.