情感和态度表达—— 劝说　Persuasion

应该

I think you ought to tell her the truth.我看你应该告诉她真相。

Should I send you the report when I finish writing it?我写完报告后应该给你发过去吗？

不应该

I don't think you should take the first job offer you get.我认为你不该干你得到的第一份工作。