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问题 关于定语从句中why和for which的互换

I finally understood the reason why my mum had encouraged me not to give up.这个句子里的why是引导定语从句吗？可以换成for which 吗？

问题 have sb do 和have sb doing

 I'm sorry to have you ______( take) the blame for my mistake. 这句话 用take 可以吗？ 为什么参考答案只能是 taking啊?

问题 请解释一下see nothing of sb的用法

I saw nothing of her during the years that intervened. 这期间的几年中我根本没见过她。请老师分析一下句中 see nothing of her 的用法。谢谢！

问题 also可用作并列连词或句子副词吗

Also you must do some exercises about the lessons. 另外你必须做些课程练习。also 引导了后面的句子应该是连词吧，查字典有连词词性，请问是并列连词吗？如果是并列连词为什么前一句用了句号，它并没有连接两个句子而是放在一个句子...

问题 as...as之间可以有哪些成分

Ten years ago the population of our village was twice as large as that of theirs.Our neighbor has as big a house as ours.You can get there just as cheaply by air as by train. 我想问的是，哪些成分放 as...as 中间，有什么规律？

问题 alive可以用于名词前作定语吗

不是说 alive 不能用于名词前作定语的吗？但下面这句呢？为什么可以？The similarities between Mars and Earth were enough to keep alive hopes of some form of Martian life. 火星和地球之间的诸多相似处足以让人们对火星上存在某种生物抱以希望。

问题 heavy curtains是惯用法吗（可否用thick curtains）

Heavy curtains blocked out the sunlight. 厚厚的窗帘挡住了阳光。请问句中的 heavy curtains 是惯用法吗？为什么不用 thick curtains 呢？

问题 have been for six months是什么意思

请问下面一句中的 has been for over six months 是什么意思：He’s unemployed at the moment and has been for over six months. 

问题 名词作主语补语/宾语补语，怎么判断是否为专有名词

Mr.Elson was president of the high school , 是否因为这所高中当时只有一个校长才作为专有名词？还是说president与Mr.Elson 同等性质才以专有名词表现

问题 再问关于until,unless的试题

I didn't believe I could do it___I got to the top of Mount Tai.A until   B unlessA答案正确，但是B答案错误的充分理由？另，题干中的could是否应该改为was able to，因为这是过去特定的‘能’，与具体事件有关。盼专家老师详尽权威解答...

问题 关于and连接两个系表结构的省略问题

请问各位老师，关于 and 连接两个系表结构的省略问题：They're usually three meters tall and are as big as the size of a classroom.and 后面的 are 是不是要省略？

问题 as well as 并列成分判断与分析

A London betting firm offers employees the chance to decide their own salary as well as being able to check what their colleagues are paid.请问此句中的as well as 后面的与前面的什么并列？

问题 due to 后接动词过去式的疑问

The additional fibres induce pores due to reduced dispersion efficiency.这是英语科技文献中的一句话，我觉得due to 中的to是介词啊，reduced应该改为reducing啊，难道是把reduced作为形容词看待？

问题 of between 的用法

...lations (75-150 million animals) and different population growth rates for the human settlers (0.65%-3.5%), and varying kill rates, Mosimann and Martin derived figures of between 279 and 1,157 years from initial contact to big-game extinction.请问老师，这里的of是哪种用法？ 有没有of...

问题 provide sth to/for 区别

The government used to provide a regular supply of relief grain for that backward area.请问,提供救济粮给落后地区,表示对象,为什么用for而不是用to呢? 另外还想问一下,此处 a regular supply of relief grain  可以倒过来写作 relief grain's regular supply 吗?