请问曹老师，when和while这里引导的分别是什么从句，while doing是什么用法？Its Intelligent Transport System tells drivers when roads are crowded, while changing traffic lights and
planning alternative routes that drivers can follow.
...ister is a teacher, but do you know _____ before she became a teacher?A. what she doesB. what her job isC. where she worked at请老师讲讲这道题，尤其是 A、B 选项，因为 what do you do? 可以表示询问对方工作，为什么此题不能选 A 呢？本题答案是 B。谢谢老师...
...都是希望老师能逐渐解答的。谢谢老师！ (1)
Yesterday, I sat with my son, determined to test my own theory on this.这里的determined表示的是状态，和谓语动作sat - 谁先发生？还是几乎同时发生？另外是表目的，方式，伴随，原因 - 哪种状语呢？...
...联盟、中国外语教师群“有问必答”（第3期）【问】We are influenced by our
culture, our biology and our time in history to notice physical beauty
quickly and rasily. 这个句子中划线的动词不定式做什么成分，麻烦专家们解答。谢谢！（老师A）个人认...
...接代词”一词，不知道是啥意思。书上说下面句子中的what就是缩合连接代词：Have you got any idea what she wants? 你知道她要什么吗?She was not happy at what he said. 对他说的话她感到不高兴。It was what he meant rather than what he said. 这是他的原...
—Darling, my routine meeting ends at 8:00 pm when, I suppose, you will have had dinner.—But I can wait本来一开始我觉得是引导时间状语从句，但不是有个用法说在条件或时间状语从句中，用现在完成时代替将来完成时吗？我估计是我对时间状语从...