should 和ought to 都为"应该"的意思，可用于各种人称。
---Ought he to go?
---Yes. I think he ought to.
表示要求，命令时，语气由 should(应该)、had better最好)、must(必须)渐强。
上一篇： will和would的区别
下一篇： 情态动词+ have +过去分词的用法
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