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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?

问题 that是引导词还是代词的辨别

People are invited to query Marilyn vos Savant, who at age 10 had tested at a mental level of someone about 23 years old; that gave her an IQ of 228 - the highest score ever recorded.这里的that是引导词还是代词呢？如果是引导词那么先行词是什么？

问题 wherever and whenever是什么意思（2020北京卷）

The app makes our practical language lessons available wherever and whenever.这是2020高考英语北京卷阅读理解A中的一个句子，这里的 wherever and whenever 是什么意思？wherever and whenever 为什么单独使用？

问题 数词做同位语的问题(both与two)

请问老师，你们俩 You two 和 You both 是否都正确？He put them both into his mouth. We both tried to get the coins.这两句话中的both可不可以都用two替换？

问题 请问这句话notice前为什么没有冠词

I asked that notice should immediately be given that I would broadcast at 9 o'clock that night.(选自丘吉尔演说Speech on Hitler's Invasion of the U.S.S.R.)  

问题 定语从句中用who不用that的问题

当先行词指人并含有较长的后置定语或在被分割的定语从句中，宜用who不用that引导定语从句。The boy was crying hard who lost his way while looking for his mother.这里是有后置定语，还是有被分割的定语从句呢？如果有，在哪里？

问题 pieces of后可以加可数名词吗

We've assumed that multi-level page tables only have two levels: a page directory and then pieces of the page table.A piece of 后面只能加不可数名词，为何pieces of 后可以加可数名词page table （页表）？请教各位老师！