英语would的用法

I am thinking about coming to Shanghai. I would come for the show, although I do not expect it to be any good. 什么意思，他来上海吗？事实上他说他仍在考虑，而我认为他要来的。犯错误了。能教一下would特殊用法吗？
我回信说欢迎他来。他说我you are getting ahead of yourself（意思是我想法超前了，对吧。所以我想我开始时理解错了。）“If I flew into Shanghai on the 15th and left on the 20th, here is how I view the schedule:“都是过去时态，晕了！还有他说：sell A for B,a和b大概都是公司的名字，不知道怎么翻。请教高手了。加分的~~~

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