虚拟语气用的最多的是在这种含有条件从句的复合句当中,主要是以下三类：
1.与现在事实相反的非真实条件句：
If I had time,I would certainly go to see you.（倒装：Had I time,…）
如果有时间,我一定去看你了.
If it weren’t for their support,we would be in a difficult situation.（倒装：Weren’t it for their support,…）
要不是他们的帮助,我们将会面临一个困难的处境.
2.与过去事实相反的非真实条件句
If I had taken your advice,I wouldn’t have made such a mistake.（倒装：Had I taken your advice,…）
如果当时听了你的话,我就不会犯这样的错误了.
If it had not been for your help,I wouldn’t have finished the work so easily.（倒装：Had it not been for your help,…）
要不是你的帮助,我的工作不会这么容易完成.
3.与将来事实相反的非真实条件句
If it rained/were to rain/should rain,I should stay at home.（倒装：Rained it/Were it to rain/Should it rain,…）如果明天下雨,我会呆在家里.