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虚拟语气是动词的一种特殊形式,用来表达说话人的意愿。请求,设想,等未能或不可能实现的事实,或说话人看来实现可能性很小的情况。做这类题时首先要弄清楚虚拟语气的各种句型,即由if引导的虚拟条件句,省略if的倒装形式,可跟虚拟语气的宾语从句,同位语从句,表语从句的句型,以及表示祝愿或感叹的句子和由without, but for等介词引导的短语或句子。(1)虚拟语气现在时。 用以表示与现在事实相反的假设或现在实现可能性不大的情况。条件从句：动词过去式(be用were)主 句：Would/should/could/might + 动词原形Eg。 If I were a bird, I would fly to you。If it were not for their help, we should be in a very difficult position。(2) 虚拟语气过去式。 表示与过去事实完全相反的假设。条件从句：had + 过去分词主 句：would/should/could/might + have +过去分词Eg。 If we had started earlier, we should not have missed the train。If she hadn’t been ill, she might have come。(3)虚拟语气将来式。 表与将来情形相反的假设或极少有可能实现的情况。条件从句：动词过去式或should +动词原形或were to +动词原形主 句：would/should/could/might +动词原形Eg。 If Professor Li should have time tomorrow, we could ask him some questions。If there should be no air, there would be no living things。。