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问题 现在分词和过去分词作状语的区别

Viewed from a distance, the scaffolding on the Capitol's dome makes the building seem perpetually out of focus.为什么这里用viewed，不用viewing？

问题 behavior 和 behavioral 的区别

The behavioral sciences has been slow to change partly because the explanatory items often seem to be directly observed.既然名词修饰名词作定语，表示分类、类别、用途等，这里的 behavioral 可以改为 behavior 吗？即 behavior sciences 表示行为一类的科学。

问题 location和position的区分

Until the late Qing Dynasty, the Guangxu Emperor changed the dumpling eating location to the Hall of Mental Cultivation (Yangxin Dian) and the stuffing became various kinds of meat.句中的location是否可以换为position？

问题 in case与in cases的用法区别

...题的“信息摘录”题：People from the West like to use these words in cases where some people in Asia may not think it necessary.句中为什么用的是 in cases 呢？但在词典上只能查到 in case 这样短语，而没有 in cases 这样的短语啊！

问题 cease to do sth和cease doing sth到底有没有区别

cease to do sth和cease doing sth到底有没有区别，请举例说明，谢谢。

问题 想请教一个has gone和has been的问题

He has gone to live abroad.He_____abroad for some time now. 1.has gone 2.has been 这里he has been abroad for some time now. 和he has gone abroad for some time now.这个区别我搞不清，麻烦老师讲一下，谢谢。

问题 down的用法

They had a special on frozen fish down at the supermarket.    此处的down是什么意思,在句子中修饰那个单词

问题 in detail可以写成in details吗

‍短语 in detail 的意思是‍“详细地”‍，如： He did not describe it in detail. 他没有详细描绘它。 We haven’t discussed the matter in detail yet. 我们还没有详尽讨论此事。 请问句中的 in detail 可以改成 in details ...

问题 advance和advancement区别

我查了一下网上，说是 advance 含有自动的意味，advancement 则含有被动的意味。给出了一个例句：Discovering a cure for AIDS would be a major medical advance．但是我觉得 discovering 这个动作还是由人来完成的，说到底这个进步还是被动的啊。...

问题 关于having been done和done

The agreement________(sign), they shook hands for the photographer.答案是signed,用having been signed可以么？

问题 ​限定语和修饰语的转化

比如 一首XXX的歌曲，可以说成XXX's song，但是这里不是限定语，而是修饰语吗？或者一首XXX's poem，不是表示属格，而是表示修饰语，请问曹老师，表达 人物+作品 的意思时，'s 是否要省略？

问题 关系代词who和that的选择

All ____ heard her speak were deeply impressed by her sincerity. A: who      B: that 应该选A还是B？还是A或B都可以？首选哪个？

问题 关于soon和early的疑问

你开始得越早，完成得就越快。这句话用 The sooner you start, the more quickly you'll finish.还是 The earlier you start, the more quickly you'll finish.

问题 有关虚拟语气的疑问（涉及be-型虚拟式和 were-型虚拟式）

...题向专家们请教：1. 有人认为现代英语只有 be-型虚拟式和 were-型虚拟式，那么除这两种虚拟式外，其他传统语法中的“虚拟语气句型”该怎么叫？2. 请具体介绍一下 be-型虚拟式和 were-型虚拟式。

问题 In between 中的in是介词吗

老师们好! In between 中的in是介词吗 如果是介词不是应该接名词吗 为啥只接一个?between He has breakfast and supper and doesn’t eat anything in between.