If +主语+had(好像是have……) had done ,主语+would have done...是表示“如果过去的过去做了什么,那么会怎样(暗指实际上没做)”的一种语境下发生 如:If you have had finished your homework ,you would not have failed in last exam.如果你有完成你的作业,那么就不会再上次考试中失败了。
第2个回答 2011-08-27
等词提到主语之前,即用倒装结构。If he had worked harder, he would 虚拟语气在从句中用should的情况: 1. 在表示建议,要求,命令,想法的动词后的