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问题 from which to do sth 的用法

Many ancient cultures built observatories from which to carry out celestial observations.许多古代文明都有建造天文台观测天象。from which 在这里当什么词性? 若拿到这两个字，对句意有影响吗?Thanks a lot.

问题 He is said to be ill主动语态是什么

He is said to be ill 是一个被动语态，它如何变为主动语态呢？

问题 step back for a second 是什么意思

请问：step back for a second 是什么意思？能用相关例句解释一下吗？

问题 offerings为什么要加-s

The first offerings of a penny paper tended to be highly sensational; human interest stories overshadowed important news, and crime and sex stories were written in full detail.此句中offering是动名词做什么成分呢？为什么要加 s ？谢谢老师！

问题 that的先行项是哪个

...的人） a set of drawings of different features that can be put together to form the face of a person, 是different features还是drawings of different features？我觉得是different features。

问题 as引导的是非限定定语从句吗

Some support risky prospects and when a product is established, as is happening with low-carbon protein, they take their capital and move to the next nascent market.老师您好，请问这里的as引导的是非限定定语从句吗？应该怎么翻译呢？谢谢

问题 more harm than good是如何省略的

To cut taxes would probably do the economy more harm than good.减税对经济而言可能弊大于利。句子中的more harm than good是如何省略的？

问题 be critical of与be critical to有何区别

有时看到 be critical of，有时看到 be critical to，请问它们有何区别？谢谢！

问题 to be self-evident作什么成分

We hold these truths to be self-evident:that all men are created.that all men are created应该是truths的同位语。但不定式作什么成分？

问题 句子成分：This place is famous for its hot spring.

This place is famous for its hot spring.请问 for its 在句子中作什么成分？hot spring 是宾补吗？

问题 We have skirts in purple for only $28.(向曾克辉老师请教)

We have skirts in purple for only $28.这里in, for是什么意思? 怎么用?

问题 would have done形式是虚拟语气还是情态动词推测性用法的讨论

...中的would have done是虚拟语气还是情态动词推测性用法：He will give his workers three days off, but only a decade earier, such an act would have required legislative approval in Virginia.They are recycling things they would have thrown away in the past.我和刘老师在回答这个...

问题 temperature后面为什么有 at which

For some substances， such as steel，the temperature at which it becomes a liquid is much higher.请问temperature 后面为什么有at？这个which是指代steel吗？

问题 about four metres long 是什么状语

About four metres long, the room served as a small reception hall for important visitors .问：这句中About four metres long，在这句中应该被称作主句的什么状语？

问题 time of sth与time for sth

Christmas is a time of reunion.能否改为介词for?有什么不同？ 谢谢老师。