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问题 control在文中怎么理解

Last month, after analyzing figures on epidemics since 1960, The Economist concluded that people die at a higher rate from such disease outbreaks in authoritarian countries than in democratic ones, even controlling for income levels.请问control for在这里是什么意思？

问题 专四练习题

...hemicals import & export company, but he---- for this industrial fair, since he is on leave.为什么现在进行时is working可以，而现在完成时has been working不对？由于怀特先生在休假，所以最近都在这个工业展览会帮忙，怎么不对？这个又不是只开一...

问题 完成进行时问题

请老师帮忙看看，这道题应该选什么呢，以及为什么。He has been receiving phone calls from journalists since he became famous.They ________ to know what will become of his life in the future.A．have wanted     B．are wantingC．want      D．wanted

问题 when从句分析

SINCE MARCH 12th, when the first hickory shad of the year succumbed to a sparkly lure, anglers of both sexes, several races and all sizes have been lining the bank of the Potomac in Washington, DC, like salmon-hungry bears. 我感觉看作定语从句和状语从句都可以，是这样么？谢谢...

问题 Tom has been out到底为何意？——看现在完成时的用法特征

...一个“时间段”的状语。例如：Tom has worked in this factory since 1990.Tom has studied English for ten years.3.一个表状态的“系表结构”，包括：be +介词短语；be +副词；be +形容词，由于本身具有持续的含义，其现在完成时，跟规则2是一样。...

问题 延续性动词的否定形式还是延续性动词吗

...能跟时间段连用，是不是不仅仅限制于完成时和完成进行时态?是不是所有时态，跟时间段连用的话，都要求是延续性动词?  2.A person can't live for more than a few days without water. live是延续性动词，can’t live还是延续性动词...

问题 现在完成时还是过去完成时

I ate some fruit, which I ______ since I was a child, and the vegetables from my garden. A.have enjoyed B.enjoyed C.enjoy D.had enjoyed能不能选择D, 还是只能选择现在完成时?

问题 此空是不是只能填because

语法填空，Dujiangyan Panda Base is the most convenient one _____ it is near to Chengdu City.除了bacuase能不能填as, since, 或者for。为什么？

问题 I was last here语法分析

I heard some changes have been made by the current president since I was last here.最后的was last here怎么解释?

问题 语气理解困惑

...拟语气，还是陈述语气？为什么？  应该怎么理解这里的时态would和时态didn't？如果是虚拟语气，根据上下文语境，正确的应该怎么表达呢？如果是陈述语气，根据上下文语境，正确的应该怎么表达呢？ 2) When you read a letter, wheth...

问题 关于might与could

Tom hasn‘t come to work since last Friday._____he have had an accident？ C. Could   D. Might 答案是C，可是我不懂D项怎么不对。 顺便问一下：would have done 只用于虚拟语气中吗？还是有其他用法，谢谢老师能够回答！

问题 one of后面可以接单数名词吗

下面这个句子中的one of后面的名词为什么没有用复数呢？The period since the revolution has been one of political turmoil. 

问题 同一个句子主动变被动由误变正确

...。书上给出的理由原话是，“一个句子的谓语动词用什么时态，决定于主语而不决定于其他句子成分”。我的想法是，即便是Guangzhou 做主语，虽然Guangzhou这个地方是一直存在的，但“造访”这个动作仍然是由人发出的。既然人...

问题 关于静态动词完成时的问题

静态动词完成时表示持续一段时间一般用for/since那么so far/before/this year/always/recently/today/never/ever表示从过去持续到现在的时间状语也可以用于静态动词完成时吗，能不能各个分析一下并给些例句，谢谢！

问题 单词在句中的成分

Now the nation’s top patent court appears completely ready to scale back on business-method patents, which have been controversial ever since they were first authorized 10 years ago.请问主句的谓语动词是appear还是ready to 呢?