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1、過去 Had done Would* have done 現(xiàn)在 Were/did Would* do 將來 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. [過去] If he smoked less, his cough might be well soon. [現(xiàn)在] If the lecturer should be late, you would have to make a speech first. [將來]主動: We must keep this in mind. 被動：This must be kept in mind. 我們必須把這個記在心里。

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