虚拟语气在条件状语从句中的应用

　　【经典例题】

　　1. If my lawyer _______ here last Saturday, he _______ me from going.

　　A. had been; would have prevented B. had been; would prevent

　　C. were; would prevent D. were; would have prevented

　　2. If I had worn my overcoat, I _______cold.

　　A. wont have caught B .couldnt have caught

　　C. wont catch D. wouldnt catch

　　3.If he ______ , he ______ that food.

　　Luckily he was sent to the hospital immediately.

　　A. was warned; would not take B. had been warned; would not have taken

　　C. would be warned; had not taken D. would have been warned; had not taken

　　4. I didnt see your sister at the meeting. If she _______, she would have met my brother.

　　A. has come B. did come C. came D. had come

　　【答案与解析】

　　1.A.本题考查虚拟语气。因为从句表示与过去事实相反的假设，故从句谓语动词用过去完成时，而主句谓语动词用would have +过去分词形式。

　　2.B.本题考查虚拟条件句中主句谓语动词的使用。因为从句用了过去完成时，可知主句谓语动词用would / could have +过去分词形式。根据句意，可知选B。

　　3.B. 根据答语，可知本题考查与过去事实相反的虚拟语气。故从句谓语动词用过去完成时，而主句谓语动词用would have +过去分词形式。

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