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问题 条件状语从句的时态问题

请问条件句的主从句通常可以用什么样的时态呢？比如这一句话：If you had to explain the most simple of procedures, you might feel frustrated. 这句话是条件句吗？ 为什么用了过去式呢？可以用现在时吗？

问题 issue a demand 是什么意思

The court issued a demand for repayment of the debt. 请问这个句子如何翻译？尤其是句中的 issue a demand 是什么意思？

问题 判断句子是否有语法错误

The AFs exhibit a long rod-like structure with the length up to several millimeters and  a cross-sectional diameter of about 35.5-37.6 μm.这个句子有没有语法错误呢？是正确的吗？请教一下老师。

问题 as...as比较结构

they stagger home loaded with as many exotic items as they can carry（课后习题答案）they stagger home loaded with as many of the exotic items as they can carry（原文）请问两句哪句正确（新概念3，41课）

问题 Had we done so用法

关于掷骰子：Had we done so, each of us would have had about 50% heads.其中Had we done so,看不懂，这是什么结构呢?

问题 如何判断是分词还是动词(worked)

在牛津词典上看到shift有如下解释：a peroid of time worked by a group workers who start work as another group finishes.请问老师，如何判断 worked 是过去分词还是动词？

问题 edge的意思和用法

Tech companies cover up their hard edges with a wide range of dubious management techniques.科技公司用各种不太靠谱的管理技巧来掩盖自己的硬心肠。问题：请问edge可翻译成"心肠"的意思？在各个字典中都找不到相近意思。

问题 句子分析

...e sun light hit me. That is all there was to my experience. Just the light of the sun. 问题：不明白“That is all there was to my experience.” 这句话的语法成分。“That is all there”是主语从句吗？

问题 let的用法

...o let younger people into government then it could affect the ability of future leaders.再就是，then这样用可以么？then是副词，放在一个句子里，不是前后需要加逗号么？谢谢老师。

问题 signaled shutdown是什么意思

新编英语第三版课文里的一句：The part of my brain that switches off when I do anything strenuous signaled shutdown and my feet moved metronomically.这里的signaled shutdown是什么意思，充当什么成分？

问题 did sightseeing是什么用法

Kristin Diehl conducted a series of experiments on photo-taking to find out whether people enjoyed it when they did sightseeing.过去式did后面为什么用ing形式（有did doing句型吗）？

问题 since引导时间状语从句

...嘛。而不能用于“已完成的影响用法”，He’s put on a lot of weight since he gave up smoking. 他戒烟后体重增加了许多。　　

问题 比较级 better 的修饰语

Is he ______ better today? Of course. A.much B.any C.a bit D.even 可以选B吗?

问题 一个句子不能有两个谓语动词吗

But perhaps the most vivid recollections are those of the toys we played with.一个句子不能有两个谓语动词，可这句话同时出现了are和played ,能解释一下吗，谢谢老师。

问题 定语从句关系代词

I ever worked for a plant of which the workers are working hard.I ever worked for a plant where the workers are working hard.I ever worked for a plant for which the workers are working hard.这三句的关系代词、副词都不一样。。。。为什么会这样呢?