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问题 play off against each other是什么意思

Elizabeth successfully played off against each other the two great Catholic powers，France and Spain. 这里的played off against each other理解不了。 each other是什么成分修饰什么？

问题 系动词的prove可以用进行时吗

All of this is proving effective and there is now some loosening of restrictions as new cases slow. 出自中国日报。作系动词的 prove 可以用进行时吗？我记得只有 feel、look 以及表示变化的系动词才可以用进行时吧。

问题 facial expressions(面部表情)为什么用复数

Anthropologists have discovered that fear, happiness, sadness, and surprise are universally reflected in facial expressions. 请问老师这句末尾"面部表情"为什么要用复数？可以写成“in the facial expression." 或”in a facial expression."吗？

问题 must表推测时可用于否定句吗

That’s surprising. Usually she’s a very cautious driver and obeys all the traffic laws. She must not have seen the sign.这个句子中的 must not have seen用得对吗？这里显然是表示推测耶，怎么用must的否定式呢？

问题 keep后面为什么可以加一般过去时形式

There was a time when a blue sky and flowers could never have kept me spellbound.keep后面不是要加动名词吗，为什么这里用spellbound一般过去时形式?

问题 《傲慢与偏见》中一句话里as的用法

The note was immediately dispatched, and its contents as quickly complied with. 后半句是省略了was的独立主格形式吗？其中的as quickly在语法上怎么解释，as 符合了什么语法规则？

问题 so(也)放在句首为什么不倒装

And as some lawyers have introduced unreasonable things into common law, so likewise many teachers have introduced absurd things into common good manners.so表示“也”放在句首不是要部分倒装吗，这里为什么没倒装?

问题 哪些动词永远不及物并且永远要后接一个介词

...书上看到，用作动词的amount永远不及物，其后永远接介词to。如：The payment amounts to $6500. 付款总计为6500美元。His investments amount to millions of dollars. 他的投资额达几百万美元。Her resignation amounts to an admission of failure. 她的辞职等于承...

问题 句子成分分析

Vaux says that Science’s idea to pass some papers to statisticians “has some merit, but a weakness is that it relies on the board of reviewing editors to identify ‘the paper that need scrutiny’ in the first place.”曹老师您好，该句中的to identify ‘the paper that need scrutiny...

问题 划分两个句子结构

Drinking while pregant will do great harm to your baby.It's better to maintain silence when you do not know what to say.请对以上两句进行句子成分划分，并作简要说明。

问题 状语修饰动词问题

You have got to get me back to the UK.1.back是副词“回到原处”的意思吗？那back是方位副词作方位状语修饰动词get吗？2.to the UK也是介词短语作方向状语修饰动词get吗？

问题 It 的指代问题

It is bad to eat food when you are going to bed.请问这里的形式主语it是指eat food还是eat food when you are going to bed？

问题 of和for的介词使用含义辨析

1)It is kind of you to help me.2)It is important for you to do come here.请教老师：有2个问题一直困扰着我：1)我知道of和for的使用区别。第二句用for sb引出后面不定式的逻辑主语，但是对第一句来说，是不是应该理解成：不定式的逻辑主语是of...

问题 主语和表语语意的不对称性

In retrospect, it was the wrong time to open a new data processing center in this city. 请问老师，句中不定式to open a new data processing center in this city 的形式主语是it吗？如果是，则为：to open a new data processing center in this city was the wrong time. to open a ...

问题 until now的准确理解和翻译

如何准确理解下面句子的含义：Until now, the above documents and information have not been provided by the Banks. 现在这些文件和资料提供了没有？Until now, the BBC has only been available in South Africa on short wave.现在在南非，中波能收到BBC广播吗？尤其...