德国队实力:I'd have gone to Tokyo if I could.中的'D是什么意思?

I'd have gone to Tokyo if I could.中的'D是什么意思? Mike has gone to the bookshop .I have to wait for him. I am gone跟I have gone有什么分别？ have been to 与have gone to 的区别 have gone to和have been to的区别是什么？ have been to 和have gone to 的区别 I have come to i've been gone for so many years之中的 have been gone 怎么解释 谢谢 I'd love to have been to与have been in还有have gone to的区别