The doctors did everything they could to save the dying old woman_英语解答

The doctors did everything they could to save the dying old woman but failed.
在文章中看到这个句子,我的疑惑是:这个句子中情态动词could后面跟了带to的不定式.有这样的用法吗?我只知道,情态动词后只跟动词原形.
谁能解答下我的疑惑,
to save...应该是不定式短语

人气：441 ℃　时间：2020-04-10 21:31:09

解答

everything（that） they could （do）省略了 that 和do 是定语从句
to save the dying old woman but failed.
目的状语