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should可作情态动词，用在各人称后，这时它的意思和ought to差不多，都可译作“应当”或“应该”：
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I should (ought to) write some letters tonight．我今晚应当写几封信。
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You shouldn’t come to such a decision hastily．你不应匆忙做出这样的决定。
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后面有时跟完成式或进行式：
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I should have thought of it．我应当想到这一点。
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You shouldn’t be reading a novel. You should be doing your homework．你现在不应当看小说，你应当做作业。
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在某些从句中（如propose，suggest等引起的从句）也常用should：
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He proposed that the Government should investigate the case．他建议政府调查这起案件。
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He wrote, suggesting that he should come to Paris．他写信建议他到巴黎来。
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It will be better that he should be out of France．他离开法国会更好些。
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有时可不用should，而直接用动词原形，特别是在美国：
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Someone suggested that they break into small groups．有人建议他们分成小组（活动）。
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It is necessary that he come to the office．有必要让他到办公室来。
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should有时可用在条件从句中，可译为“万一”（有时还可用在句首，这时要用倒装语序）：
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If you should be passing, do come and see us．万一你从这儿经过，一定来看我们。
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If it should happen, what shall we do？万一这事发生，我们怎么办？
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Should I be free tomorrow, I will come．万一我明天有空，我会来。
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有时还可表示惊异、不以为然等情绪（常可译作“竟然”）：
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It is dreadful that anyone should be so miserable．真可怕有人竟会这样可怜。
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It seems so unfair that this should happen to me．这事竟然发生在我身上太不公平了。
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I can’t think why he should have said that．我不明白他为什么竟说出这样的话来。
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Why should you talk to her like that？你为什么竟对她这样讲话？
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would常可用来提出请求或问题（比用will显得更委婉）：
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Would you kindly send me the author’s address？你可否把作者的地址寄给我？
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Would you please look over my essay？请你烦神把我的文章看一遍。
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