Wait until the children settle down before you start the lesson.Wait until the children settle down before you start the lesson.据我所知,until 应该是用在否定句中,这里是否是用错了啊?

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Waituntilthechildrensettledownbeforeyoustartthelesson.Waituntilthechildrensettledownbeforeyoustartth

Wait until the children settle down before you start the lesson.Wait until the children settle down before you start the lesson.据我所知,until 应该是用在否定句中,这里是否是用错了啊?
Wait until the children settle down before you start the lesson.
Wait until the children settle down before you start the lesson.据我所知,until 应该是用在否定句中,这里是否是用错了啊?

Wait until the children settle down before you start the lesson.Wait until the children settle down before you start the lesson.据我所知,until 应该是用在否定句中,这里是否是用错了啊?
until当然也可以用在肯定句中的,表示句子的动作一直持续到until短语所表示的时间为止,即表示动作的终点.一般可译为“直到……时(为止)”或“在……以前”.在这种用法中,句子的谓语动词必须是持续动词(非瞬间动词).
这句话翻译成 等到孩子们安静下来再开始上课.