英语 虚拟语气一直受到语言学家及语法学家们的关注。他们从各个方面对虚拟语气进行了分析，包括给虚拟语气下定义，进行分类，讨论其在交际中的功能，甚至也争论其存在的价值，而随着语言学发展，虚拟语气的意义构建成为研究重点。学好虚拟语气对于学习英语的整体有着极大的帮助!

　　英语虚拟语气学习指导1.虚拟语气在条件句中的用法

　　(1)若表示与现在事实相反的假设，则条件从句中用过去式，主句中用过去将来式(would，should，could，might + 动词原形);若表示某事将来实现的可能性不大，则条件从句中用should + 动词原形也可用“were to+动词原形”或用过去式动词。

　　I would certainly go if I had time.(现在)

　　If it should rain，we wouldn’t go out.(将来)

　　If I knew German，I would read the paper to you.(现在)

　　If he were here，we could ask him.(现在)

　　(2)若表示与过去事实相反的假设，从句中用过去完成式，主句中用过去将来完成式(should，would，could，might + have + 过去分词)。

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　　If I had worked hard at school, I would be an engineer, too. 如果我在学校学习刻苦的话，我现在也会使工程师了

　　If they had informed us, we would not come here now. 如果他们通知过我们的话，我们现在就不会来这里了。

　　②从句的动作与现在事实相反，而主句的动作与过去事实不符。

　　If he were free today, we would have sent him to Beijing. 如果他今天有空的话，我们会已经派他去北京了。

　　If he knew her, he would have greeted her. 要是他认识她的话，他肯定会去问候她了。

　　③从句的动作与过去发生的情况相反，而主句的动作与现在正在发生的情况相反。

　　If it had not been raining too much, the crops would be growing much better. 如果天不下太多的雨的话，庄家会长得更好。

　　If he had been working hard, he would be working in the office now. 要是他工作一直努力的话，他现在已进了办公室了。