这句英语语法怎么用呢would never have done

would never have done
麻烦用例句解释一下,谢谢啦

would never have done 的意思是 本不会做某事(实际上已经做了),例如:
If she didn't see what happened that day, he would never have killed her. 要不是她那天看见发生了什么,他永远也不会杀了她.
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