同学你好，该知识点来自沪江网校《新概念英语第二册【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
until主句中的谓语动词为一般过去时时，从句中的谓语动词为过去完成时，用来强调从句谓语动词的动作发生在主句谓语动词表示的动作之前。试比较：
Li Lei didn't come until the film had begun. 直到电影开演，李雷才来。

其实按照汉语“直到……才……”更好理解，直到他完成工作，我们才打扰
也就是We didn't disturb him until he had finished work. 这个说法更恰当，或者也可以前后都用一般过去时，因为时间顺序比较明显，比如
He did not agree until I had talked to him for a long time.
我劝说了半天，他才肯了。
He did not stop until he reached the door.
他走到门边才停下。

祝同学学习进步~