求虚拟语气的讲解 had sb done sth,sb would have not done

题目

求虚拟语气的讲解 had sb done sth,sb would have not done
had sb done sth,sb would have not done这个句型是什么意思 怎么用

答案

这个是条件状语从句中的虚拟语气,对过去的虚拟,had提前,省掉if,原句是：
If sb had done sth,sb would have not done.意思是如果某人做了...,某人就不会...,例句：
If he had taken my advice,he wouldn't have failed.
或者Had he taken my advice,he wouldn't have failed.
意思是如果他听取了我的建议,他就不会失败.