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问题 关于状语从句的省略

...以在现在分词前加上相应的从属连词:when,while,though,after,before,if等。从属连词加现在分词可以视为状语从句的省略。 那像在这样的例句中: When He heard the good news, he jumped with great joy. 变成 When hearing the good news, he jumped with great joy.并...

问题 这两个不定式应该怎么解释？最后面的现在进行时的被动语态呢？

before classes,some teachers would ask their students to hand in their mobile phone to prevent from being distracted.

问题 分析句子结构

National Geographic Expeditions grew from this legacy as a way to invite others to explore and encounter the wonders of our world up close.可以帮忙分析一下句子结构吗？

问题 necessary 后置的用法

Then, and only then, are his services necessary. necessary 可以后置吗，是表when neccessary的意思？还是省略了that is

问题 句子分析

只有徘徊，只有匆匆罢了。Nothing but to hesitate， to rush.请问老师，1.这个句子nothing but是可以独立成句吗？2.to hesitate和to rush没有and连接是因为它在不完全列举吗，但是感觉中文句子没有不完全列举的意思。

问题 as 用法

The potential conflicts of are not that exist between investors and those who have been hired to run the business are not as relevant. 请问as在这里的用法？

问题 as引导什么从句

This is a matter of tweeting and twittering as one drifts through cyberspace.请问老师as在这里引导什么从句？

问题 句子分析与理解

And since we’re now about done with the eighth grade, that, my friend, make....这句话的前半部分应该怎样理解翻译，帮忙分析一下。

问题 get as是什么意思

有这样一个句子：You never know who you’ll get as a roommate; it’s just a matter of luck.有get as 这个搭配吗？但我在词典上没有查到，查了get和as这两个词。请解释一下这个get as的用法。谢谢！

问题 use,useful,used的用法

下面是一道月考题：Many adults learn English, because it is _______ (use) in their work. 正确答案为 useful，但我写的是 used，可以吗？但是我觉得，它们只是含义不同，但语法都没有错，是这样吗？

问题 decide on的理解与用法

It is often difficult to decide on the inventor of certain inventions. 请问这里的 decide on 是什么意思呢？decide 及物不及物时意思不同吗？

问题 明明有可能是事实什么用虚拟语气

If someone opened a burger bar, they’d really rake it in. 如果有人开一家汉堡包店，一定会发大财的。从句意思来看，这明明有可能是事实嘛，但什么用虚拟语气呢？

问题 when 能不能引导原因状语从句

看到这么一句话：It was foolish of you to take a taxi when you could easily walk there in five minutes.有的说 when 是引导原因状语从句，有的说 when 不能引导原因状语从句，到底怎么回事呢？谢谢！

问题 请问cause后面可以接动名词作宾语吗

You mean it will cause flooding？请问 flooding 在这里是动名词还是名词呢?

问题 enough的词性（是否是代词）

The question provides its own answer: if you are worrying about the amount of protein in your diet, then you are almost certainly eating more than enough. 这里的more than程度副词修饰enough代词吗？enough指代protein?