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问题 while doing 的用法疑问

请问老师while在这里是什么用法？Its Intelligent Transport System tells drivers when roads are crowded, while changing traffic lights and planning alternative routes that drivers can follow.

问题 in 与after表示一段时间用法

...以后：He came back after two days. 他两天后就回来了。He will come back in two days. 他过两天就回来。我觉得 in+时间段也可以表示以过去某一时间点为起点的一段时间之后，此时等同于 after+时间段，可用于过去时态。She learnt to drive in three...

问题 the same as的判断

...：I studied at Cambridge at the same time as(when/that) he did.例3：If you’re likely to be traveling on the same train as(that) I am, I’ll look out for you.例4：a few oil firms today could re-creat the same threats to competition that(as)  were feared nearly a century ago in the U.S....

问题 of doing结构能否看作是从句的简化

...她以她惯用的办法推说没有时间。请问这两个句子中的of doing 结构能否看作是定语从句的简化，如果可以，这两个定语从句简化以前是什么样子呢？

问题 这还是是虚拟语气吗

If you were to have asked me, I would have been only too willing to help，这里的were to have done是表示过去虚拟等于had done那么要么改成are to have done那么他表示的是现在还是将来了，他还算是虚拟吗

问题 能否去掉do not，在seem后加not，而句子含义不发生改变呢？

Certainly people do not seem less interested in success and its signs now than formerly.当然，现在人们对成功及其标志的兴趣与以前相比似乎丝毫未减。请问上述句子能否去掉do not，在seem后加not，而句子含义不发生改变呢？就是变成这样：Certainly ...

问题 句式分析

In a negotiation, your goal is to get all your deal points and as many of your trading points as possible, recognizing that often you’ll have to yield one or more trading points to get your deal points.分词recognizing在整个句中做什么成份？

问题 keep doing 与 keep having done的用法与区别

英语肯定是可以说 keep doing sth 的，比如：The baby kept crying for an hour.但是，英语可否说 keep having done sth 呢？比如：The baby kept having cried for an hour.

问题 为什么用 listen for而不用 listen to

Listen for relationshipsTo listen for a relationship, you need to pay attention to how people talk to each other and some particular questions in the conversation.请问这里为什么用 listen for，而不用 listen to 呢？

问题 a hint of a smile与the hint of smile

“Do the dead frighten you?” Ser Waymar Royce asked with just the hint of a smile. 这是冰与火之歌中的一个句子，其中 with just the hint of a smile 中译版本是带着一丝微笑，这里为什么不用 a hint of a smile呢？ 用 the hint of会有微笑的暗示的意思。

问题 有关虚拟语气的选择题

...择题，请问怎么选？If I hadn't stood under the ladder to catch you when you fell, you ______ now.A. wouldn't be smiling                            B. couldn't have smiledC. won't smile   &nbs...

问题 词性困惑，句子类型困惑

...都是表语从句。The chances are that the thief will be under 21 and doing it for a lark."doing it for a lark"应该是从句伴随状语,为什么句子用and而不是,隔开？

问题 be done doing sth的用法

I am done trying, 请问done的使用？为什么不是 I have done trying?

问题 can not help but do的意思

Wasn't I tempting fate: how could these hard-nosed Nazi detectives help but smell out the diaries beneath my broadcasts?can not help but do意思是不可避免、情不自禁的做.....但是这里变成特殊疑问句，没有了can not 还是那个意思吗？翻译句子有点乱了!

问题 doing做状语时和前面的主句用不用逗号隔开

doing做状语时，和前面的主句用不用逗号隔开？或者有没有逗号，是不是不一样的含义？She came running towards me.The children ran out of the room, laughing and talking merrily.一个有逗号，一个没逗号，意义有区别吗？谢谢!