题目

下面句子怎么理解啊,最后一个had后面做什么成分的?
Researchers of the Pleistocene epoch have developed all sorts of more or less fanciful model schemes of how they would have arranged the Ice Age had they been in charge of events.

提问时间：2021-01-25

答案

Researchers【主语】of the Pleistocene epoch【修饰主语的介词短语（定语）】have developed【谓语,现在完成时】all sorts of more or less fanciful model schemes【宾语（及前面作修饰的定语短语）】of【介词引导介词短语作宾语的定语,后面跟的从句作of的宾语】how【引导词引导宾语从句】they【宾语从句的主语】would have arranged【宾语从句的谓语,虚拟语气,完成时】the Ice Age【宾语从句的宾语】had they been in charge of events【倒装的条件状语从句,过去完成时】.
这句最难懂的是最后一个条件状语从句
had they been in charge of events
这句省略了引导词if.这种j省略必须通过倒置才许可,即把助动词had搬到句首.还原的句子是
if they had been in charge of events
（如果他们决定发生的事件）.当然这个条件不可能发生,没有研究者能回到远古时代去决定那时的事件.所以这句是虚拟语气.而这类虚拟语气的条件状语从句,通常省略if而把had放到句首.