until 的用法

一、until 用于肯定句中，意为“直到……为止”，主句中的谓语动词应用延续性动词。如：
I waited for you until two o'clock yesterday. 我昨天一直等你到两点。

He worked until 11. 他一直工作到11点。
I watched TV until she came back. 我看电视一直看到她回来。
二、until 用于否定句中，构成 not...until，意为“直到……才”，主句中的谓语动词应用短暂性（非延续性）动词，此时 until 可用 before 代替。如：
即“在……以前不”。例如：
The children didn't go to bed until 11 o'clock last night. 昨天晚上，孩子们直到十一点才睡觉。
​He did not go to bed until 12. 他12点才睡觉。
I did not watch TV until she came back. （= I began to watch TV when/after she came back.） 直到她回来我才开始看电视。
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