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百度文库- 让每个人平等地提升自我11 语法复习：虚拟语气和倒装句知识总结与归纳：虚拟语气：是一种与事实（包括过去，现在或将来）完全相反的陈述，表示假设，愿望，怀疑，推测或后悔。虚拟语气主要用于条件从句，让步从句和名词性从句。虚拟语气句型中常见的动词形式：1. 动词过去式2. had done 3. would/could/should/might do 4. would/could/should/might have done 5. were （一）虚拟语气用在与过去事实相反的假设的条件句中：表示假设，后悔或推测。句型结构： If + 主语 +had been/done⋯.，主语 +should/could/might/would + have done⋯.1. If the illness had been diagnosed a day earlier, it might have made all different. 2. If she had told him about the danger, he would not have got hurt. 3. If I had known more about giving first aid, I could have helped him. （二）虚拟语气用在与现在事实相反的假设的条件句中：句型结构： If + 主语 +were / 动词过去式，主语+should/could/might/would +do 1. If I had HIV, I would know because I would feel sick. 2. If I were you, I would give an AIDS patient a hug. 3. 虚拟语气用在与将来的结果相反的假设的条件句中：句型结构： If + 主语 +were to do, 主语 +should/could/might/would +do If + 主语 +should do If + 主语 +动词过去式（ 1）If we were to panic, we would not be able to help. （ 2）If the little girl should take piano lessons, she would have less free time. （ 3）If I were to live long enough to have a job, I would choose to be a doctor, helping these AIDS patients. 注意：虚拟条件句的从句中如果有助动词were; had 或 should 可以去掉 if 以后用倒装句语序。例句：① Had I not helped him, he would have failed in business. ② Should I be free, I would come . ③ Were she my daughter, I could suggest a different plan . 注意：有时候，主，从句所描述的时间范围不一致，则根据具体语境调整动词的形式。例句：① If he had caught the train, he would be here by now. ②...