人教新课标高中英语必修三：Unit2 Healthy eating-Grammar-302edu教育资源网

b. 表示劝告、建议或命令时，should和ought to可通用，但在疑问句中常用should。ought to的否定式为oughtn’t to或ought not to。

You should / ought to go to class right away. Should I open the window? What should we do next?

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