until是一个英语单词，可以用作介词和连词，可以翻译为到…为止、在…以前，等等。
单词简介
until
[英][ənˈtɪl][美][ʌnˈtɪl]
prep.到…为止；在…以前;
conj.到…为止，在…以前；直到…才;
例句
1.German sources are saying that Zetsche will have his chairman's contract extended until the end of 2016.
德国方面的消息人士称，齐泽将把自己董事长的合约延长至2016年末。
2.Until then,where did I put that cellphone charger again.
到那时，我的手机充电器该何去何从呢？
3.That is, of course, until the computers render us useless.
直到计算机把我们全部顶替。
4.Repeat until the stain is gone.
可重复使用直至脏点消除。
5.Over 3million apps and watchfaces have been downloaded, but until now,users have had to download those via third-party sites like MyPebbleFaces.
Pebble应用程序和桌面的下载次数已超300万，但迄今为止，用户必须通过MyPebbleFaces.com等第三方网站来进行下载。
单词用法
till / until在表达方式和意义上的特殊性：until是till的强调形式，但是它们表达的意义是相同的，都表示"直到某时"。不过，当主句是否定句时，它引出的意思是"直到（某时）（某动作）才（发生）" ，这时候常会出现"not until …"的结构，如果将 "not until …"的结构放在句首，那么主句要写成倒装句。例如：
He didn't go to sleep until 12 last night .
他昨晚直到十二点钟才睡觉。
They didn't realize their fault till we pointed it out to them .
直到我们向他们指出了他们的错误，他们才意识到。
Not until we pointed out their fault to them did they realize it .
直到我们向他们指出了他们的错误，他们才意识到。
但是，当主句是肯定句时，它引出的意思是"直到（某时某动作停止了）"。例如：
The students made much noise till the teacher came into the classroom .
直到老师走进教室学生们才停止了大声喧哗。
The young couple were very happy until they used up all their money .
那对年青夫妇直到花光了所有的钱才沮丧起来。
另外，until 可以放在句首而till则不行。我们可以说：Until they used up all their money, the young couple were very happy .我们却不可以说：Till they used up all their money, the young couple were very happy .
此两个连词意义相同。肯定形式表示的意思是"做某事直至某时"，动词必须是延续性的。否定形式表达的意思是"直至某时才做某事"。动词为延续性或非延续性都可 以。正确使用这两个连词的关键之一就在于判断句中的动词该用肯定式还是否定式。
肯定句：
I slept until midnight. 我一直睡到半夜时醒了。
Wait till I call you. 等着我叫你。
（在肯定句中可用before代替 Let's get in the wheat before the sun sets.）
否定句：
She didn't arrive until 6 o'clock.
她直到6点才到。
Don't get off the bus until it has stopped.
公共汽车停稳后再下车。
I didn't manage to do it until you had explained how. 直到你教我后，我才会做。
1)Until可用于句首，而till通常不用于句首。
Until you told me, I had heard nothing of what happened.
直到你告诉我以前，出了什么事我一点也不知道。
2)Until when 疑问句中，until要放在句首。
---Until when are you staying? 你呆到什么时候？
--- Until next Monday. 呆到下周一。
注意：否定句可用另外两种句式表示。
(1）Not until …在句首，主句用倒装。
Not until the early years of the 19th century did man know what heat is.
直到19 世纪初，人类才知道热能是什么。
Not until I began to work did I realize how much time I had wasted.
直到我开始工作，我才认识到了我已蹉了几多岁月。
短语搭配
Until One 合而为一 ; 唱片名
Until You 直到遇见你 ; 直到你 ; 直到遇到你 ; 直到你出现
until now 到目前为止 ; 直到现在 ; 至今 ; 迄今
Until dried 直至胶水凝固
Until when 要到什么时候 ; 直到当 ; 何时才
until dawn 直到黎明
until after 直到 ; 直至
Until it 直到才 ; 直到
until Tuseday 遇见星期二