it’s gone为什么不用it have gone

it’s gone为什么不用it have gone 还有it's gone,为什么这么表达? What's gone,It's never comingback. it has gone与it was gone it"s gone,whoever,whatever是什么意思 where's it gone是什么的缩写? It's gone with the wind. It isn’t that long (3 days) _____ I have gone,but it seems s it is gone let it gone Maybe it has gone! what's gone is gone.It's no use talking about it any more.