②You ought to have returned the book earlier. ③You ought not to have refused his offer. 情态动词+have done 用法 例句 needn’t have done 表示做了本来不必去做的事,“没必要做而做了”。 温馨提示 didn’t need to do表示“没必要做而实际上也没有做某事”。 ①You needn’t have brought the book because Tom has one here.
②I didn’t need to buy the dictionary.I had a copy at home. (2017·高考陕西卷) My book,The House of Hades,is missing. Who ________ have taken it? A.need
B.must C.should
D.could D 一、if条件从句中的虚拟语气 类别 用法 例句 if引导的条件从句 与现在事实相反 从句谓语动词:过去式(be用were) 主句谓语动词:should/would/could/might+动词原形 Sorry, I am too busy now. If I had time, I would certainly go for an outing with you. 很抱歉,我现在非常忙。若我有时间,我将一定与你外出郊游。
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