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？ 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 had it. 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 had lunch为什么用两个have? I have already had lunch.改为否定句. I have already had lunch.(变为一般疑问句） When I wanted to have ________apple after lunch,I found my brother had had it.A.one more B.an C.another D.the other i feel hungry.let is stop _______ A.havinglunch B .to have lunch C .had lunch D.have lunch I have had lunch at school.对at school提问可不可以填where have you had lunch? Have you had lunch yet? Have you had ( )Lunch?--yes,i had( )good dinner at my friend's house,too 如果一个英国人告诉我I have had lunch at school,我可不可以这么问：where did you have lunch?说错了，英国人说是I have had lunch 我问的是where did you have lunch？ I have just had my lunch的句子成分在I have just had my lunch这句话中,I 是主语,have 现在完成时的标志,had lunch 的原型是have lunch 但是是现在完成时,所以have lunch 要变成had lunch ,对吗? 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 1.Lucy ______ (lend)Lily some money three days ago.2.______you______(have)lunch yet?Yes,I have.I've just had it.3.He ______ (think)hard and then he had an idea.