【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.