高一英语：英语语法情态动词的用法介绍2
2017-02-12 22:08:54
来源：精品学习网
ought to
1. ought没有人称或时态的变化，后跟带to的不定式。常译作“应该”，“应当”等，和should同义，只是口气稍重一些。其否定式为ought not to (oughtn't to )，疑问式为Ought I /you to„?
You ought to start at once. 你应该立刻出发。
Such things ought not to be done. 这种事不应该干。
--Ought he to go? 他应该走了? --Yes, he ought to. 是的，应该走了。
2. 表可能性
Mary ought to be home by now. 玛丽这会儿该是到家了。
There is a fine sunset. It ought to be a fine day tomorrow. 今天有晚霞，明天应该是个好天。
It ought to be a fine day tomorrow morning. 明天旱晨大概是个好天气。
3. 表示没有履行过去的义务时，用“ought to +完成时。
You ought to have told me about this earlier.(But you didn't) 你本来应该早一点把此事告诉我。(但没有)
I ought to have written that letter yesterday.(But I didn't) 我本应该昨天写那封信。(但我没写)
It ought to have been done long ago.这事早该做完的。
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