新东方考研语法讲堂63

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5、should/ought to have done的含义。 “should/ought to have＋过去分词”表示“过去应该做谋事却没有做”；“should not/ought not to have＋过去分词”表示“做了不应该做的事”。含有责备或遗憾的意思。例如：
    You shouldn’t /oughtn’t to have come here alone at such a late hour. 你这么晚的时候本不一该一个人来这里的。（实际是一个人来的）
    She should/ought to have gone there alone. 她本该一个人去那里的。（实际上不是）　
    You should have come here ten minutes earlier. 你本应该早１０分钟来才是。
    The boy shouldn’t have been playing the piano. 那孩子不应该一直在弹钢琴。
    6、might, may, must表示推测时的区别: may，might, must可表示 推 测“可能”.根据表示可能性的大小，我们把这三个词排列为：might<may<must（或许→可能→肯定）。例如：
    It might rain tomorrow. (将来)明天可能下雨。
    They might be watching TV now. (现在)他们可能正在看电视。
    Jane might have visited the Summer Palace last year. (过去)去年珍妮可能去过颐和园。
    He may have something important to do. (现在)他可能有更重要的事要做。
    They may have been to Shanghai last summer. (过去)去年夏天他们可能去过上海。
    There must be something wrong with him. (现在)他肯定出问题了。
    He must have made a mistake. (过去)他一定是犯了个错误。