should和ought to表示责任、建议或劝告，翻译为“应该”，后者语气强一些。
例句：
You should listen to the doctor's advice if you want to recover soon.
Such things ought not to be allowed.
should接动词的完成式，是一种谴责，表示过去应该做而没有做或过去做了而不应该做。
例句：
I missed the class. I should have come earlier.
I shouldn't have made such a foolish mistake.
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