until引导的时间状语从句用什么时态,请举下例子~

until引导的时间状语从句用什么时态,请举下例子~
until引导的时间状语从句用什么时态,请举下例子~

until引导的时间状语从句用什么时态,请举下例子~
一、until与by的区别
1.by表示在某特定的时间之前或不迟于某特定的时间,意为"最迟在;不迟于"或"在……之前"等.如:
①I will finish my task by nine.我将在九点钟前完成任务.
②The plane takes off at 10:00,so you must try to be at the airport by 9:30.飞机在十点钟起飞,所以你必须在九点半赶到机场.
2.until用在肯定句,谓语动词通常是延续性动词,如stand,stay,talk,wait等,表示主句动作终止的时间.如:
③I waited until he came back.我一直等到他回来.
④The war lasted until 1945.战争持续到1945年.
如果用在否定句,谓语动词通常是瞬间性动词,如open,start,leave,arrive,finish,stop等,强调主句动作开始的时间.如:
⑤I didn't leave the boy until his mother turned up.直到这孩子的母亲来,我才离开.
⑥The noise of the street didn't stop until it was midnight.街上的噪音直到半夜才停止.
二、until与before的区别
1.可直接换用的情况:在until能使用的句型中,即主句含有否定式终止性谓语动词或肯定式延续性动词,可与before直接替换,意义差别不大.如:
①The students won't go home until / before they finish their homework.学生们要先完成作业才能回家.
②The woman worked in the factory until/before 1990.1990年以前这妇女在这家工厂上班.
2.不可换用的情况:当主句含有肯定式终止性谓语动词时,只能用before不能用until,且before常意为"没来得及……"或"……才……"等.如:
③Einstein almost knocked me down before he saw me.爱因斯坦差不多将我撞倒才看见了我.
④He had measured me before I could get in a word.我还没来得及插话,他就把我的尺寸量好了.
三、not until的倒装与强调结构
1.当Not until位于句首时,句子要倒装.其结构为:Not until+从句/表时间的词+助动词+(主句)主语+谓语+.如:
①Not until the teacher came in did the students stop talking.直到老师进来学生们才停止讲话.
②Not until next week will the sports meet be held.直到下周才开运动会.
2.not until的强调结构为:It is / was not until+从句/表时间的词+that+.上面两句改为强调句为:
③It was not until the teacher came in that the students stopped talking.
④It is not until next week that the sports meet will be held.

以until引导的时间状语从句用过去时，主句仍用过去时
例如：He didn't believe it until he saw it with his own eyes.

1.
直到...时,到...为止
He worked in Hong Kong until his father found him a job in Canada.在他父亲给他在加拿大找到差事前,他一直在香港工作。
(主句用一般过去时，until引导的从句也用一般过去时)
2.
(用于否定句)在...以前,直到...才
She didn't g...

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1.
直到...时,到...为止
He worked in Hong Kong until his father found him a job in Canada.在他父亲给他在加拿大找到差事前,他一直在香港工作。
(主句用一般过去时，until引导的从句也用一般过去时)
2.
(用于否定句)在...以前,直到...才
She didn't go to bed until her daughter came 她一直等到女儿回来才去睡觉。(主句用一般过去时，until引导的从句也用一般过去时)
3.
I will not go home until I finish my job. 我要做完工作才回家。(主句用一般将来时，until引导的从句用一般现在时)
建议：不要死记主句用什么时态，从句用什么时态，这样学语法很累的，且，万一记错了，就全军覆灭。考虑时态时，要根据句子所表达的意思（即：行为的先后），才考虑采用哪种时态。

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