not .until直到.才 时态用法会的来I didn't do my homework until my mother came back这句子前面的动词是过去式 后面动词也过去式,可是我刚刚听人说 前面动词是过去式后面动词是现在时.到底not .until直到.

not .until直到.才 时态用法会的来I didn't do my homework until my mother came back这句子前面的动词是过去式 后面动词也过去式,可是我刚刚听人说 前面动词是过去式后面动词是现在时.到底not .until直到.
not .until直到.才 时态用法会的来
I didn't do my homework until my mother came back
这句子前面的动词是过去式 后面动词也过去式,可是我刚刚听人说 前面动词是过去式后面动词是现在时.
到底not .until直到.才 时态用法是什么啊?
是前V 过去 后V过去
还是前V过去 后V现在啊?

not .until直到.才 时态用法会的来I didn't do my homework until my mother came back这句子前面的动词是过去式 后面动词也过去式,可是我刚刚听人说 前面动词是过去式后面动词是现在时.到底not .until直到.
你的这句是正确的,前边如果一般现在时的话后面也是一样,如果是过去式的话那么后面也是过去式.
也就是前V过去=后V过去.
前V现在=后V现在.
until直到...时, 到...为止
例句:
I couldn't sew until I was six.
我直到六岁时才会用针缝东西.
We can't start the job until we have the approval from the authority concerned.
没有有关当局的批准我们不能开始这项工作.
He waited until the volcano became quiet and he was able to return two days later.
他一直等到火山平息下来,两天后他才得以重回火山上.

应该是前者啊，没见过你说的第二种用法

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:...

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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.

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