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问题 分词与动名词

...nkton species in the laboratory and then computing community grazing rates for field conditions using the known population density of grazers.在句子最后using前面是不是应该加by，因为是通过已知的的密度。

问题 what引导的名词性从句分析

He is seeking redress for what he alleges was an unfair demotion. 请问这句话怎么分析句子结构？what引导的宾语从句下what he alleges又是主语从句？有点混乱，希望老师能帮梳理一下。

问题 above criticism 为什么没有冠词

His action, which arose from his concern for the welfare of the commune members, is above criticism.请问句中的 above criticism 为什么没有冠词？

问题 at the age of与by the age of的用法与区别

_______ the age of seven, children are capable of thinking in abstract terms.A. By     B. At     C. On      D. With答案是A。为什么不是 B 呢？

问题 代词用法以及复杂句

We can do a wide variety of things for our clients: we can type all their letters and prepare any documents that they might need sending out.老师们好，请问这句话中的they到底是指clients 还是documents? 后面的that从句是同位语从句吗？（意思有点怪怪的！）

问题 介词后能否跟融合性连接副词？

这是我看到的一句句子：The year 2016 is remembered as when voters opted for Donald Trump and Brexit.这个as应该是介词，那后面的when是否就是融合性连接副词作介词as的宾语？

问题 引导词what和which

What struck me most in the movie was the father's deep love for his son.为什么引导词不用which，而用what？关于主语从句和宾语从句什么时候用引导词which老师可否补充一下相关知识，以及什么时候用what。

问题 learn是终结性动词还是非终结性动词

i have learned English for two hours 另外这是现在完成时表示事件意义，这句话对吗，谢谢!

问题 if怎么理解

...as focused on offices this past year, it is because that is where the room for debate is greatest. 译为如果或尽管都有点不太通顺。我觉得原文意思是说：之所以本专栏过去一年关注办公室问题，是因为这个问题可讨论的空间最大。 谢谢各位大咖专...

问题 higher than后的成分

By 1996 foreign-born immigrants who arrived before 1970 had a home ownership rate for 75.6 percent, higher than the 69.8 percent rate among native-born Americans.请问老师，higher than后的成分作什么成分？

问题 go through的用法

A year and a half later, however, of the seventy-odd staff and workers who had come in for the course, only six went through.请问老师go through在这里的用法是什么？在字典里好像没有看到sb. go through的用法？

问题 be concerned by的用法

They were concerned by the lack of healthy activities for young men in cities such as London. 老师好！这是改错题，为什么这句话中的concerned by不改成concerned with呢？

问题 fortune后面为什么加of

It's hoped Paolo di Canio will change the fortunes of, or improve the situation, for Sunderland想问一下，fortune后面为什么加个of呢?

问题 after与such as用法的问题

...nd、but、expect、save，并没有after。2、Things such as  these are the best themes.我的第二个问题：这里的“such as”是诸如、此类的意思吗？如果是，那么such as“诸如、此类”后面结句子的话可否有权威例句？

问题 关于where关系副词的范围划分问题

Economy The process or system by which goods and services are produced, sold, and bought in a country or region以上定义来自韦氏高阶词典问题：这条定义当中的by which能否替换成where作为”抽象性地方名词process/system”的关系副词去自行理解。常用的关...