问题 as if 后的虚拟语气能不能用would have done表示过去

as if 之后的虚拟语气，句子能不能用would have done表示过去？as if后面虚拟语气是否只能用had done 表示过去？

问题 请问这里的as作为什么成分？

In spite of the considerable work as China has done in its campaign to control smoking and use of tobacco, the situation of smoking control still remains grim.as这里是关系代词，在定语从句里面指代的是the considerable work，所以它在定语从句里面应该做宾语吗？

问题 这里的as算引导比较分句吗

Records of the astronomical universe, despite the fact that we see distant things as they were long ago, are limited in the extreme.

问题 如何理解这里的定语从句that they might not have ?

...ey can take on risks that they might not have before. 如何理解这里的定语从句that they might not have ? 是不是这样：  they can take on risks that they might not have (taken on) before. ？如果是这样的话，为什么不是might have not takend on...我什么是might not have t...

问题 as we all know是定语从句还是状语从句

问题 books boom是什么意思（为什么用复数作定语）

Maybe the books boom has affected only the top of the educational pile. 这是2007年山东高考英语阅读理解中的一个句子，请问：books boom 是什么意思？为什么用复数作定语？谢谢专家老师！

问题 it引导分裂句

在高中英语北师大版教材上发现这个句子：It is December that we are going away.教材解释的是it 引导分裂句可以把新信息和已知的信息联系起来，it在这里指的是时间，那that在这里是什么从句呢？

问题 可以举例一些where引导抽象地点的例句吗（最好不要网上常见的...）

问题 表示“公园”的专有名词要不要定冠词

下面一句是2008年高考英语天津卷的考题： The last time we had great fun was ______ we were visiting the Water Park. A. where         B. how         C. when        D. why 本题答案是C，这不是疑问所在，我...

问题 这里的said为过去式还是过去分词呢

Species at one time was thought to have become extinct at the time of the dinosaurs. An Indonesia fisherman has caught a coelacanth,(逗号) an ancient fish once thought to have become extinct at the time of the dinosaurs ,(逗号) a fishery expert said (就是这里) on Monday.按理说用前面用...

话题 定语从句

话题 双重定语从句

话题 定语从句简化

话题 嵌套型定语从句

话题 定语从句省略