would 表虚拟语气 将会，可能会
should 是应该，本应该
所以用would
听见他说英语，你可能会认为他是外国人
should 本应该做某事却没有做,表示责备和遗憾.
如; You should ahve told me the news eariler.
would 表示与事实相反。
如： If I were to go tomorrow, I would take a plane..(与将来事实相反)
would表将来
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