until的用法詳解
下面本站小編爲大家帶來Until的用法詳解：
表示“直到……爲止”,兩者常可換用,只是 until 比 till稍正式,所以在正式文體中,一般用 until,而在口語或非正式文體中則兩者都可用.從其後所接成分來看,till多與名詞或較短的從句連用,而較長較複雜的成分多用 until,位於句首時也多用 until.兩者在用法上應注意以下幾點：
1.引導時間狀語從句時,其謂語要用現在時表示將來意義.如：
I won’t leave until he comes back tomorrow.我要等他明天回來後再走.
Continue in this direction until you see a sign.一直朝着這個方向走就看見指示牌了.
2.相關主句謂語必須是持續性動詞,若是終止性動詞,則應爲否定式(因爲終上性動詞一旦被否定就成爲狀態,便可持續).如：
He waited until she was about to leave.他等着一直到她準備離開.
She didn’t marry until she was over fifty.她直到50多歲才結婚.
3.有時其後可跟副詞或介詞短語等.如：
He has been ill until recently.他最近一直生病.
Until when are you going to stay here?你在這兒要待到什麼時候?
We didn’t eat till past midnight.直到午夜過後我們才吃飯.
She won’t go home until after the exam.她要考完試之後再回家.
如果語境的需要,有時甚至可以接帶有“引導詞”的從句.如：
Don’t leave until after I’ve spoken to you.我和你說完後再離開.
4.用於 not…until [till]…結構
(1) 可用於It is (was) not until [till]…that…這樣的強調句型.如：
It was not until I met you that I knew real happiness.直到我遇到你以後,我才真正體會到幸福.
It was not until she took off her dark glasses that I realized she was a famous film star.直到她取下墨鏡,我才意識到她是一位著名影星.
(2) 若主句動詞爲終止性動詞,其意爲“直到……才……”;若主句爲持續性動詞,其意爲“不到……就……”.比較：
They didn’t find her till the next day.他們直到第二天才找到她.
He didn’t wait until I returned.他沒等到我回來(沒等我回來他就走了).
有時 until 或 till 可以換成 before.如：
Until [Before] you told me,I had no idea of it.在你告訴我之前,我對此一無所知.(即直到你告訴我,我才知道)
(3) 若將not until [till]置於句首,其後的主句要用倒裝語序.如：
Not until much later did she learn who her real father was.她很久以後才知道她真正的父親是誰.
Not until he received her letter did he fully understand the depth of her feelings.他直到收到她的信之後才充分理解她的感情有多深.
until雙語例句：
1、From September until December, Congress remained in session.
從9月到12月，國會一直都在開會。
2、The aid will not be disbursed until next year.
援助款到明年纔會下撥。
3、Sarah was nine years old and until that moment she had been locked in a world of her own.
薩拉當時9歲，之前她一直封閉在自己的世界裏。
4、Our pilot reduced height until we hugged the ground.
飛行員降低了高度，最後我們緊貼着地面飛行。
5、The prospect of having to pay a graduate tax until retirement would kill the students 'enthusiasm stone dead.
想到今後一直到退休爲止都要繳畢業稅，學生們的積極性會被徹底打消。
