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问题 after having two periods of a challenge为什么用不定冠词

after having two periods of a challenge这句话为什么是不定冠词a，为什么不可以用the或者零冠词？

问题 为什么限制性定语从句没有主句

...nd hard it till 2 P.M. Two gourds of beer divided between old and young in the evening. Women working in their gardens normally.此文出自《全球通史》中一名人类学家对于食物采集部落1933年9月3号的行为记录。看是看得懂的，但是不明白为何这样行文，限制...

问题 use...as 与 use...for 的区别与选择

向各位老师请教一个问题：Wind power uses the wind ______ energy.在这句话中，横线处填 as 还是 for 呢？这道题给的答案是 as，我的理解是用 as 强调 wind 在 wind power 中的角色，风推动风力发电设备运转发电。但我觉得 for 也没...

问题 man和woman表泛指时其前习惯上不可用冠词吗？

在书上看到：man和woman表泛指时，其前习惯上不可用冠词，也不用复数。如：She believes that the union of man and woman in holy matrimony is for ever. 但我觉得用复数是完全可能的，请老师们指点一下，谢谢！

问题 during childhood与during one’s child

下面句子用的是during childhood： The girl became blind during childhood. 这女孩童年时就失明了。 请问一下，这个during childhood可以说成during her childhood吗？感觉during后面直接跟名词有点怪怪的。

问题 如何理解：Ten minutes running away 

人教版高中英语必修六第70页有这样一句： Ten minutes running away from the sea is all you need to save yourself from danger. 不太明白这里的 ten minutes 是什么用法，它与后面的动名词是什么关系？

问题 easily修饰形容词原级的用法归纳

... 可以修饰形容词的原级，比如 accessible, available 等，如：The castle is easily accessible by road.但《朗文》只给出了 accessible, available 这两个形容词，其余的就用“等等”省掉了，在此不知能否请专家老师帮我归纳一下有关的用法，比如...

问题 do sth for preparation与do sth for preparations的区别

下面句子中的 preparation 为什么不用复数？During exam time we have a special programme that tells students the things they should do for preparation.来自：译林版高中英语模块一Unit 1

问题 environmental-friendly 与 environmentally-friendly

...tally-friendly paper. 我们的小册子是用环保纸张印刷的。Half the people polled said they would pay more for environmentally-friendly food. 半数受调者说他们愿意多花钱买环保食物。但看到这样一句：Consumers are demanding more environmental-friendly products. ...

问题 选择适当的词填空(who,which,that,but)

They've got a chief executive who can provide strong leadership,               we certainly haven't got at the moment.A  who    B  which   C   that    D   but请选择可能的选项...

问题 复数物主代词后面的名词用单数还是复数（可以用单数表示各自的吗）

In the south part of China, many people even go to work by boat. Because water is around their _______(house).这里的 house 必须是用复数吗？我觉的单数也可以，表示他们各自的房子。另外，句子里的 work 是动词词性吗？

问题 make sure you don't...的时态分析

...！用括号内单词或词组的正确形式填空：Before you hand in the paper, make sure you _______ (not make) any mistakes in it.答案是: don't make我不能理解，为什么是 don't make ? 为什么不可以是 didn't make 或 won't make 呢？我想知道为什么...

问题 过去完成时与过去进行时的辨别

...hn一He           me; he really meant it for the best.A. hadn't been criticizingB. hadn't criticizedC. wasn't criticizingD. wouldn't criticize老师，这道题目为什么B不可以，既然shouldn't have got angry是对过去的虚拟，那么批...

问题 为什么现在分词的被动语态形式being done不可以表示状态

为什么现在分词的被动语态形式being done不可以表示状态？另外，对于曹老师在他的回答中举出的这个例子：Being beaten by his father, Tom cried loudly.正确Being liked by all the students, Tom was elected monitor. 错误错误的这句要怎么改正呢？

问题 steal its way，cheat its way怎么理解

句一: Put plainly, this country seems determined to steal its way up the economic ladder at our expense. 句二: This country schemed and cheated its way to stealing American jobs and that those jobs could be dragged home by using enough force.老师好，steal its way，cheat its way这...