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1、过去 Had done Would* have done 现在 Were/did Would* do 将来 Should do/were/were to do Would* do 例句：If there hadn’t been much rain in spring, we would have had a good harvest now. [过去] If he smoked less, his cough might be well soon. [现在] If the lecturer should be late, you would have to make a speech first. [将来]主动: We must keep this in mind. 被动：This must be kept in mind. 我们必须把这个记在心里。

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