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. (2016·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。 类别 用法 例句 if引导的条件从句 与过去事实相反 从句谓语动词:had+过去分词 主句谓语动词:should/would/could/might+have+过去分词 (2016·高考北京卷)If we had booked a table earlier,we couldn’t be standing here in a queue. 如果我们早订张桌子的话,我们就不会站在这儿排队了。 与将 来事 实相 反 从句谓语动词:过去式/were+不定式/should+动词原形主句谓语动词:should/would/could/might+动词原形 Grace doesn’t want to move to New York because she thinks if she were to live there, she wouldn’t be able to see her parents very often. Grace不想搬到纽约,因为她想如果要是住那里,她将不可能经常地见到她的父母。 类别 用法 例句 if引导的条件从句的倒装 混合条件句的 虚拟语气 如果在表示虚拟语气的条件句中含有were,had或should,可将if省略,然后将were,had或should移至主语之前。 Had we made a great effort we might have succeeded.(=If we had made a great effort...)要是我们付出巨大的努力,也许我们已经成功了。 有时条件句的动作与主句动作发生的时间不一致,这时动词的形式应根据它们表示的时间加以调整。 (2016·高考天津卷)If he had spent more time practising speaking English before,he would be able to speak it much better now. 如果以前他花更多时间练习说英语的话,现在他英语就会说得好多了。 1.(2016·高考北京卷)We __________ back in the hotel now if you didn’t lose the map. A.are B.were C.will be
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