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问题 选择题中用现在完成时还是过去完成时的疑问

You will never guess who I met yesterday. My old teacher! We ______ for 20 years.是用 have not  met 还是 had not met? 我认为是后者，意思是“你不会猜到我昨天见到谁，我的老师！我们用20年没见了（到昨天为止）”。但答案给的是前者。我想 We ha...

问题 sign up for与for coverage的理解与翻译

问题之一：I sit down, sign up for all my classes, get into them, and I'm happy.我的疑问：sign 是不及物动词为什么不直接用 sign for, 而一定要加上副词 up 呢？问题之二：And it remains to be seen whether large numbers of younger, healthier Americans will sign up ...

问题 play music与back to earth的用法疑问

They also light lamps and play music because they think that will lead the ancestors back to earth. 人们还点起灯笼，奏响乐曲，因为他们一位这样做可以把祖先引到世上。问题1：为什么用 play music？可以 sing music 吗（我也知道这个读起来很怪，不顺...

问题 请老师帮忙看一下summarize这几个句子

请老师鉴定一下，下面这几个句子，那些是错误的，那些是对的，那个最好，谢谢谢谢！！(1) It also provides relevant graph and table to summarize institution setting, procedure and responsibilities.(2) It also provides relevant graph and table for summary from such a...

问题 It is difficult for sb to do sth中的for sb是什么成分

It is difficult for us to finish writing 中的 for us 作什么成分？

问题 the greatest and best known后接不接名词分别是什么词组

One of the greatest and best known of his essays is Nature.这里的 the greatest and best known 是不是名词词组？One of the greatest and best known essays is Nature.这里的 the greatest and best known 是不是形容词词组？

问题 典型的非持续动词如arrive等有进行态但没有简单现在时——这种说法对吗

“典型的非持续动词如arrive（来到）、jump（跳）、eat（吃）等有进行态，没有简单现在时”——这种说法正确吗？

问题 could find no way是什么意思（等于could not find ways吗）

Newton regarded his refutation of mechanism as an ‘absurdity’, but could find no way around it despite much effort.请问：could find no way 是什么意思？等于 could not find ways 吗？

问题 Leave no corner un-searched的un-searched为什么后置

Leave no corner un-searched 这里的 un-searched 为什么后置 ? 这句型是固定搭配吗 ? 谢谢回答!

问题 翻译：He is taking the Rights of Man with him to Swed

我是初学者，谢帮助我译一下这个句子。作点句法分析。谢谢!He is taking the Rights of Man with him to Sweden.

问题 用cannot have failed表示对现在事实的一个陈述吗

The idea that modern art can only be seen in museums is mistaken.Even people who take no interest in art cannot have failed to notice examples of modern sculpture on display in public places.1.这里不是对现在事实的一个陈述吗，为什么用cannot have failed，难道想表达“之前...

问题 as if 的虚拟式应用had done吗

我们英语语法网 http://www.yygrammar.com/Article/200802/130.html  的文章上有这么一句话：I remember the whole thing as if it happened yesterday. 整个这件事我记得很清楚，就仿佛是昨天发生似的。 从句意来看，我记得很清楚，仿佛昨天发...

问题 介词+which+time/place 能引导限制性定语从句吗

介词+which+time / place 能引导限制性定语从句吗？为什么？还要追问一些关系副词被介词+which的用法。比如：I will never forget the day when I first met you on the ship.I will never forget the day on which I first met you on the ship.I will never forget the day on whi...

问题 The child is father of the man. 中冠词的有无问题

The child is father of the man. 三岁看到老。 对于本句：为什么 father 前没有冠词，而 man 前却用了冠词。我的感觉是：father 前要用冠词，而 man 前不能用冠词。即应该说成：The child is the father of man. 三岁看到老。 

问题 句子翻译（涉及it, itself的指代问题等）

请老师帮助翻译一下下面加粗的句子，我有疑问的地方在后面标出了谢谢！Likewise, a full-scale break-up would cripple the platforms'economies of scale,worsening the service they offer consumers. And even then ,in all likelihood one of the Googlettes or Facebabies ...