not...untill的用法
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发布时间：2022-05-20 00:55
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时间：2023-10-21 12:59
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跎了几多岁月。
(2) It is not until… that…until /和till既可用作介词也可用作连词，引导状语。通常有以下几种用法：
一、 用于肯定句作“直到……为止”解时，主句的动词一般是延续到until / till所表示的时间为止。例如：
1. He waits until / till the children are asleep. 他等着直到孩子们睡熟。
2. I shall stay here until / till twelve o'clock. 我将留在这里一直到十二点钟。
二、 用于否定句作“在……以前”、“直到才”解时，主句的动词一般是非延续性的，它所表示的动作直到until / till 所表示的时间才发生。例如：
1. He didn't come until / till late in the morning. 他直到早上很迟才来。
2. He didn't arrive until / till the game had begun. 直到比赛开始他才到。
注意：主句为一般将来时，until / till引导的从句用一般现在时代替将来时。例如：
He couldn't ride until / till he was fifteen years old. 他直到十五岁才会骑自行车。
三、 用于“not...until...”的句式可以转换成when 或after引导的时间状语从句，但主句必须要用肯定形式。例如：
1. They didn't get off until the train came to a complete stop.=They got off
after the train came to a complete stop. 火车停了他们才下车。
2. The student won't come into the classroom until the teachers finish their work.=The students will come into the classroom when the teachers finish their work. 当老师们完成工作时，学生们将走进教室。
四、 用于延续性动词的肯定或否定句中，但含义不同。例如：
1. The meeting continued until / till 7:00. 会议一直开到七点。
2. We didn't have the meeting until /till 7:00. 直到七点我们才结束会议。
五、 用于“It is / was not until...that”或含有“not...until...”的强调结构中，其中的until不能改为till。例如：
1. It was not until the film had begun that he arrived. 直到电影开始他才到。
2. It is not until 8:00 that we begin our class every day. 我们每天八点开始上课。
六、 Not until放在句首时，句子要倒装，其中的until不能改为till 。例如：
1. Not until the last moment did he change his mind. 直到最后一刻他才改变主意。
2. Not until midnight did it stop raining. 直到午夜雨才停。
七、 句首通常只用until,不用till。例如：
1. Until then, I knew nothing at all about it. 在那之前，我对此事一无所知。
2. Until you told me I had no idea of it. 在你告诉我之前，我对此一无所知。
八、 某些固定词组或谚语中通常只用till。例如：
1. from morning till night 从早到晚。
2. up till now直到现在
