2.用于虚拟语气中时,表示与过去事实相反。 You must have caught the bus if you had got up earlier. 如果你早一点儿起床的话,你准能赶上那一班公共汽车了。(事实上没有赶上公共汽车) He must have won the game if he had been careful enough. 如果他足够细心的话,他准能赢得比赛。.
D. needn't have done 用于对过去的责备,表示“没有必要做某事,可是做了”。 The airport is close to us. You needn't have hurried there early. 机场离这儿很近,你没必要早早地赶到那里。(可是你早早地到那儿了) He is still young. You needn't have sent him such an expensive present. 他还小,你没必要送他这么昂贵的礼物。 注意: 如表示“过去不必做也没有做”之意,需用didn't need to do。 It is not cold today. I didn't need to take the thick sweaters out. 今天天气不冷,我没有必要把厚毛衣拿出来。(实际上也没拿)E. should ought to have done
1.表示对过去动作的责备或批评。 You should have gone over your lessons. (In fact you didn't go over your lessons.) 你们应把功课复习好的。(可事实上你们没有。) You shouldn't have watched TV last night. (In fact you watched TV last night.) 你们昨天晚上本不该看电视。(可你们看了。)
You oughtn't to have entered the teachers' office without permission. 没有经过允许,你们本不该进老师的办公室。 You oughtn't to have gone to the deserted place alone. 你不该独自去那荒凉之地。
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