普通人
坚持不懈的心
在表示虚假的，与事实相反的或难以实现的情况时用虚拟语气；表示主观愿望的或情感时，也用虚拟语气。
与现在事实相反的虚拟语气。常用结构为：条件句的谓语动词为were或动词的过去式，主句谓语动词为“would/should/could/might+动词原形”。例如lf l were ten years younger,l would start all over again.lf l had enough money,l would first of all buy myself a new comupter.
与过去事实相反的虚拟语气。常用结构为：从句用“had+过去分词”，主句用“would/should/could/might+have done”。例如：lf we had had enough rain last year,we could have gained a good harvest.
与将来事实相反的虚拟语气。常用结构为：从句谓语可用动词过去式，“should+动词原形”或“were to+动词原形”来表示。例如：lf l should see/were to see/saw him tomorrow,l would invite him home.
省略if的虚拟语气。if虚拟条件句中有should，had或were时，if可以省略，从句中主谓要倒装。例如：lf l had worked hard,l would have surely succeeded.Had l worked hard,l would have surely succeeded.
混合虚拟语气。有时主句从句所指的时间不一样，这叫混合虚拟语气。它要求主从句跟据实际时间概念确定。例如：lf she had followed the doctor`s advice ,she would be quite all right now.Had you told me the news yesterday ,l would not be so worried now.
含蓄虚拟语气。有时假设的条件不通过条件从句表达，而隐藏在介词短语中，如：without 、 but for、 otherwise 、or等。例如：But for your advice ,l would have failed.=lf you had not given me advice ,l would have failed.
要坚持不懈哦
这是大致的虚拟语气用法，大家可以在私下多多学习