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问题 while doing 的逻辑主语判断

During the Petrochemical PTA plant upgrade, the production capacity was expanded from 225 Kt/a to 400 Kt/a while achieving a 32% reduction in overall energy consumption.这句话应该没有语法错误，但是这个while achieving的逻辑主语是哪个呢？

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 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?

问题 句末介词in的省略问题

There is so much to do and I have so little time to do it in.我是听美国人说的这句话。这句话结尾的in是否用法错误？还是说其实不是错误，只是可以删除的啰嗦？

问题 关于句中except的用法疑问

语法书上看见个例句it has snowed except in the southeast. 这里except作为连词还是介词？如果except做连词的话后面应该是接句子，这里介宾结构不是句子，但是except做介词的话，这里介词后面还能跟介宾吗?麻烦老师了

问题 if从句的多个问题

1. It makes me wonder if he likes going out this weekend.2. The researchers began to ask people if they had time to be subjects.请问老师if从句在上面两个句子中作什么成分呢？3. If 引导主语从句可以放在句子开头吗？4. if能引导表语从句吗？

问题 “美国的”表达上的不同

New data show that America’s divorce rate has continued its plunge.问：此句中“美国的离婚率”为什么用了“America’s divorce rate”却没有用“American divorce rate”,这里的America’s与American，在词义和用法上都有什么区别？

问题 where从句为什么放在句末

You will find it strongest and more violent where there is the lowest degree of culture.（张道真大学英语语法书)where从句为什么放在这里（句末）？是什么语法结构？谢谢！

问题 后半句是双重否定嘛(如何翻译)

There was no lack of figures to indicate the United States’ clear industrial superiority. Yet nothing was more compelling than seeing it with one’s own eyes.

问题 since after是什么用法

Economy is one powerful motive for camping, since after the initial outlay upon equipment, or through hiring it, the total expense can be far less than the cost of hotels.请问为什么两个 since after 连在一起用啊？

问题 这里为啥选made而不是have made

The bread is really delicious. Thank you. I（）it myself.为啥括号里答案是made而不是have made呢？

问题 副词和副词小品词的区别

1 The light is off.2 You can turn it off.请问老师：1 是不是只有在“短语动词”结构中的副词才能是“副词小品词”？2 上面例句1中的 off 只能叫副词，不能叫小品词，对吗？例句2中 off才能叫小品词？

问题 一个高考题句子的理解与翻译

下面的句子摘自 2016 年高考江苏卷完形填空：Never at a loss for words, I tried to find things in my life that might qualify for growth.这句不太好理解，更不好翻译，尤其句子的最后部分。 原文背景：Never at a loss for words, I tried to find things in my ...