until的用法举例．

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一.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:
　　I waited until he came back.我一直等到他回来。
　　The 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:

　　I didn't leave the boy until his mother turned up.直到这孩子的母亲来,我才离开。
　　The noise of the street didn't stop until it was midnight.街上的噪音直到半夜才停止。

二 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:
　　Not until the teacher came in did the students stop talking.直到老师进来学生们才停止讲话。

　　Not 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:
　　It was not until the teacher came in that the students stopped talking.
　　It is not until next week that the sports meet will be held.