until和before的区别

Question

如题所述

Answer 1

一.Before表示“在… 之前”,而until表示“直到…才…”,主句肯定表示主句动作的终止时间,主句否定强调动作的起始时间.
1,主句为否定时,谓语动词为终止性动词.常见的动词有open, start, leave, go, arrive, finish, begin, stop, etc.
For example:
1), The noise of the street didn’t stop before/until it was midnight.
2), The children won’t come back until/before it is dark.
3), I didn’t leave the lonely boy before/until his mother came home.
2,主句为肯定式,谓语为延续性动词.这类动词有：stand, live, stay, talk, be, wait, etc.
For example:
1). He lived with his parents until/before he graduated from school.
2). I will wait before/until he comes to my help.
3). I shall stay here until/before you come back.
二.列情况下宜用before不用until.
1.主句为肯定式,谓语为终止性动词时只用before.
For example:
1). He fell asleep before I could take off his clothes.
2). We arrived there before it started to rain.
3). The holiday came to an end before I knew it.
4). He almost knocked me down before he saw me.
2.主句谓语动词强调动作的迟缓性,只用before,这时常伴有时间段状语或时间段暗示.
For example:
It was quite a long time before he found the elephant.过了很长时间,他才找到大象.
We had walked a long way before we found some water.走了很长的路我们才找到水.
We had sailed for two days before we saw the land.航行了两天我们才发现陆地.
It was midnight before my brother came home.我哥哥直到半夜才回来.
3.如果强调从句谓语动作未发生就发生主句谓语动作,只用before,这时常译为“未及（不等）……就……”
For example:
1）We can leave early in the morning before it gets too hot.趁天还不太热,我们上午早点离开.
2）I must write it down before I forget it.趁我还未忘,我必须把它记下来.
4.表示“与其说……倒不如……”,“与其……毋宁……”的意思时只用before.
For example:
I would give up my job before I agree to be dismissed.我与其被解雇还不如先辞职.
He will die of hunger before he steals.他宁愿饿死也不愿意去偷.

Answer 2

until直到---时候和before以前