Ought to

ought to modal v (neg 否定式 ought not to; contracted form 缩约式 oughtn't to ) 1 (a) (indicating obligation 表示责任或义务) We ought to start at once. 我们应当马上动身. You ought to say you're sorry. 你应该说声对不起. Such things ought not to be allowed. 这类事不该容许. They oughtn't to let their dog run on the road. 他们不该把狗放出来满街跑. `Ought I to write to say thank you?' `Yes, I think you ought (to).' ｀我应该写封感谢信吗?＇｀对, 我看应该写.＇ She ought to have been more careful. 她本该小心些. =>Usage 1 at must 见must所附用法第1项. (b) (indicating advice or recommendation 表示劝告或推荐) You ought to improve your English before going to work in America. 你应该把英语学好些再去美国工作. There ought to be more buses during the rush hour. 高峰期间应该多开几趟公共汽车. You ought to see her new film. 你应当看看她新拍的电影. She ought to have been a teacher, ie She would probably have been a good one. 她本该当教师（很可能是个好教师）. =>Usage 2 at must 见must所附用法第2项. 2 (drawing a tentative conclusion 作推测性的结论) If he started at nine, he ought to be here by now. 要是他九点出发, 现在该到这儿了. That ought to be enough food for all of us. 那些该够我们大家吃的了. Look at the sky it ought to be a fine afternoon. 看看天--下午一定很晴朗. =>Usage 3 at must 见must所附用法第3项.