Search as they would,they could find nobody.这个句子从句中的助动词为什么用would?

问题描述:

Search as they would,they could find nobody.这个句子从句中的助动词为什么用would?

最简单的方法,could是情态动词 find是跟在could后面的及物动词,只剩would当助动词啦.