I have had lunch为什么用两个have?

I have had lunch为什么用两个have? I have had lunch ,it's the hottest day,I have had so far,这两句话中的hv had 为什么要用 I have already had lunch 是什么结构 i have alreay had my lunch 【】you [ ]your lunch [ 英语翻译如 I have already had lunch.l have just had lunch.那l have had lunch.怎么译？ Have you had your lunch?为什么用have提问,中间的had又是什么意思 I have had lunch.怎么变成过去完成时变成后是不是：I had had lunch. I have already had lunch.--为什么在already前要加have,下面不行吗?I already had lunch,--这句是不是语法不对啊,本人语法忘的差不多了.I have already had lunch.--------------------------现在完成时,不用加already也 Have you had lunch time?为什么用had不用原型呢? Had i know her name,_______.B i would have invited her to have lunch 为什么选B I have already had lunch.改为否定句. I have already had lunch.(变为一般疑问句） i feel hungry.let is stop _______ A.havinglunch B .to have lunch C .had lunch D.have lunch 英语语法：After I had had lunch at a village pub,I l英语语法：After I had had lunch at a village pub,I looked for my bag.句中为什么要用两个had? I have had lunch at school.对at school提问可不可以填where have you had lunch? I’ve lived here for twenty years.have后面为什么不用加 alreadyI’ve had lunch.这句话对吗 Have you had lunch yet? I've already had lunch过去完成时,这句短语中请问怎么运用理解啊?其中have or had 第一句中为什么要加have 是因为有already在才多一个have吗?had lunch就是吃过午饭的意思.为什么要多加个have?I had already