他要是知道了延误的事，就会等着了。
Had he known about the delay, he would have waited.
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had英 /hæd/|美 /hæd/
known英 /nəʊn/|美 /noʊn/
would英 /wʊd/|美 /wʊd/
waited英 /ˈweɪtɪd/|美 /ˈweɪtɪd/
解释
Had he known 是 If he had known 的倒装形式，省略 if 后将助动词 Had 提至主语 he 前；would have waited 由情态动词 would + have + 过去分词 waited 构成，表示在过去假设条件下本应发生的结果。整个结构表达对过去未实现情况的虚拟假设。
Had he known about the delay, he would have waited.
Had he known 是 If he had known 的倒装形式，省略 if 后将助动词 Had 提至主语 he 前；would have waited 由情态动词 would + have + 过去分词 waited 构成，表示在过去假设条件下本应发生的结果。整个结构表达对过去未实现情况的虚拟假设。