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1、过去虚拟语气和陈述语气的过去式相同，但动词be 要用were形式表示过去情况的虚拟条件句1. 表示过去情况的虚拟条件句动词形式可以下表表示条件从句中的谓语主句谓语相当于过去完成时的形式had doneWould have +过去分词这类句子表示与事实相反的情况或实现可能性不大的情况If I had known you were coming, I would have met you at the airport.(但是我不知道)If anything had happened, he would have left us know.在主句中，如果主语是第一人称，也有人用should构成谓语。
2、 I should (would) have talked to mother if I had thought of it. I should (would) never have done it, if hadnt been so hard up. 2. 主句也可以用could和might构成谓语If my father had lived, he could have done all this for me.有时可以用should（应当）构成谓语If he had received the present, he should have thanked her.例题:If he _，h
3、e _ that food.Luckily he was sent to the hospital immediately.A.was warned，would not takeB.had been warned，would not have takenC.would be warned，had not takenD.would have been warned，had not taken此题应选B。该题考查与过去事实相反的虚拟语气：此时条件从句的谓语用had+过去分词，主句的谓语用would(should，could，might)+have+过去分词1.If she had worked h
4、arder，she _.A.would succeed B.had succeededC.should succeed D.would have succeeded2.If my lawyer _ here last Saturday，he _me from going.A.had been; would have preventedB.had been; would preventC.were; wouldD.were; would have prevented3.I didnt see your sister at the meeting. If she_，she would have met my brother.A.has come B.did comeC.came D.had come4.You didnt let me drive. If we _ in turn，you_ so tired.A.drove; didnt getB.drove; wouldnt getC.were driving; wouldnt getD.had driven; wouldnt have got
