2009年12月大学英语四六级考试语法精要(五)

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　　虚拟语气

　　1. 表示现在/过去/将来情况的虚拟条件句

　　虚拟条件句主要有三种结构：

　　1)　表示与现在情况相反：主句谓语用“would / could / might +动词原形”，从句谓语用“动词的一般过去时”(动词be的过去式一律用were)。

　　If I were you, I would not accept his offer.

　　If I had time, I would certainly go to the cinema with you.

　　2) 表示与过去情况相反：主句谓语用“would / could / might + have +过去分词”，从句谓语用过去完成时。

　　If I had got up a little earlier, I wouldn’t have missed the train.

　　If I had been more careful, I might have passed that exam.

　　3) 表示与将来情况相反：主句谓语用“would / could / might +动词原形”，从句谓语用“were +动词不定式”或“should +动词原形”。

　　If I were to do the job, I would not be able to have enough time to study.

　　If it should rain tomorrow, I would not go out with you.

　　2. 虚拟条件句连接词if的省略

　　如果虚拟条件句的从句中含有were, had, should, could等词时，可以省略连接词if，但这时必须把were, had, should, could等词移到主语前面，形成倒装。这种句型主要用于书面形式。

　　Were I to do the job, I would finish doing it within two weeks.

　　Had it not been for his help, we couldn’t have arrived there on time.

　　Should it rain tomorrow, I would stay at home.

　　3. wish后宾语从句中的谓语构成

　　动词wish后的宾语从句表示未实现的或不可能实现的愿望，其宾语从句中的谓语动词要用虚拟语气，有以下三种构成形式。

　　1) 表示现在不可能实现的愿望，宾语从句中的谓语动词用一般过去时。(be的过去式为were)。

　　I wish I had enough money to buy a car.

　　I wish I were as young and energetic as you.