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。