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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。 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 wouldnt 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 couldnt have arrived there on time. | 
