CET4英语语法：should与ought to用法辨析

　　1）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。

　　【例如】

　　You should listen to the doctor's advice if you want to recover soon.

　　Such things ought not to be allowed.

　　2）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。

　　【例如】

　　I missed the class. I should have come earlier.

　　I shouldn't have made such a foolish mistake.