苹果手机当无线网卡:请问英语until有几种意义和用法?

until
un.til
AHD:[¾n-t¹l“]
D.J.[(n6til]
K.K.[(n6t!l]
prep.（介词）
Up to the time of:
直到…的时候：
We danced until dawn.
我们跳舞一直跳到天亮
Before (a specified time):
在（某一特定的时间）以前：
She can't leave until Friday.
在星期五之前她不能离开
Scots Unto; to.
【苏格兰】 去到…的上面；去…
conj.（连接词）
Up to the time that:
直到…的时候：
We walked until it got dark.
我们一直走到天黑了下来
Before:
在…之前：
You cannot leave until your work is finished.
在你的工作被完成以前你不能离开
To the point or extent that:
直到：直到…的程度：
I talked until I was hoarse.See Usage Note at till 2
我一直说到声音嘶哑参见 till2

until
[En5til, Qn5til]
conj.
(=up to the time when)到...时为止; 直到...时
[用在否定句中](=before)在...以前; 不到...(不)
直到...地方; 直到...程度
I will wait here until the concert is over.
我将一直在这儿等到音乐会结束。
Until he returns, nothing can be done.
他不回来什么也不能做。
Go straight on until you come to a large building.
一直往前走, 直到你走到一座大楼。
【说明】till与until同义, 但在主句前的从句或短语中, 通常用until。例如:
Until then, I knew nothing at all about it.
在那时以前, 我对这事一无所知。

until
[En5til, Qn5til]
prep.
(=to the time of)直到...时, 到...为止
[常用在否定句中](=before)在...以前; 直到...才; 不到...(不)
until his death
直到他死
until four o'clock
直到四点钟
He did not go until night.
他直到夜里才走。
It was not until yesterday that I noticed it.
直到昨天我才注意到这件事。

You cannot leave until your work is finished.

I think this sentence should be "You cannot leave until your work have been finished. "