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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 宾语从句中介词与引导词的位置关系

I dont know to what this relates与I don't know what this relates to 这两个句子一样吗？还是说有一个是错的。

问题 现在完成进行时含义的理解

Mr Wang （王健林） has been looking to buy a Hollywood studio for several years and was reported to be in talks with DreamWorks Animation last year, but a deal was not announced.请问：has been looking 是现在完成进行时，那么 look 这个动作到底完成没有？

问题 介词短语在句子中的位置问题

Chef Marc Forgione made his name with a "new American" approach to food.上文可以改为这样吗？Chef Marc Forgione made his name to food with a "new American" approach.两句话有什么不同？谢谢老师的回答。

问题 不定式表动作的承接

One winter morning in 1945, I got home after my deliveries to find a boy of my age at my doorstep.问：句中to find a boy of my age at my doorstep.是不定式作什么句子成分？根据语义它应该是表示一种动作的“承接”吧？请老师说明一个这个不定式的用法？

问题 not once倒装还原问题

Not once have I done it. = I have not once done it.Not once did they change their plan. = They did not once change their plan.Not once has she failed to keep her promise. = She has not once failed to keep her promise.请问老师：以上倒装还原对吗？

问题 为什么within a stone's throw of a railway station用of

...he saw an advertisement for a suitable house in Hampshirewhich was claimed to be within a stone's throw of a railway stationfrom which there were frequent trains to London.为什么within a stone's throw of a railway station中使用了of?词典上within a stone's throw of 50 meters, 这...

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 in recent years通常连用什么时态

...s. 印度近年来经历了很多政治变动。 Unemployment among the over forties has risen sharply in recent years. 最近几年 40 岁以上的人的失业率大幅上升。 归纳起来，in recent years 通常都连用些什么时态呢？谢谢！

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 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？