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问题 from which 的用法分析

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? 若拿掉这两个字，对句意有影响吗?Thanks a lot.

问题 请问consistent在句子中什么词性

Restaurants are careful about keeping the taste of their dishes consistent. Customers like to know what they're getting when ordering something.请问consistent在句子中什么词性？

问题 无法判断这个that从句是什么从句

The system seems to be working the most efficiently that it has ever worked.请问这个句子中的 that 从句是什么从句？句子是什么意思？

问题 条件状语从句的时态问题

请问条件句的主从句通常可以用什么样的时态呢？比如这一句话：If you had to explain the most simple of procedures, you might feel frustrated. 这句话是条件句吗？ 为什么用了过去式呢？可以用现在时吗？

问题 choose与choose from的用法辨析

Hawaii is surely the first place for you to choose.这个句子是否正确？choose 后面是否应该加 from 呢？

问题 动名词逻辑主语的判断

After many years working and raising a family, she should be finally free to enjoy herself.说是逻辑主语，又好像不对，工作的应是人。难道说 working and raising a family 是定语修饰years？

问题 数词+of等于量词的用法吗？

There were about eighty of them. Their ages were from about nine to twenty.老师，数词+of等于量词的用法吗；from about...等介词接介词短语的词有那些，多不多？

问题 是否是宾语从句的判断

Why is it asking Hong Kong to pass a law that so clearly challenges the freedoms the nation enjoyed and which the party said it would keep？这里的which the party 是作challenges的宾语吗，引导的宾语从句吗？

问题 let的用法

...法，let+sb+介词，是省略了什么么？If people are reluctant to let younger people into government then it could affect the ability of future leaders.再就是，then这样用可以么？then是副词，放在一个句子里，不是前后需要加逗号么？谢谢老师。

问题 put...on notice结构

America's Federal Trade Commission (FTC) puts corporate America on notice that regulators will act if firms fail to provide adequate data security. 请问这里的put...on notice中，on notice做什么成分？

问题 句子结构

...hat the time had now come when sap should stir in the trees and life begin to move in the soil he could not have told himself. how是怎么用的呢?看翻译应该是一般疑问句，但是没有助动词，从句好像也不成立。很疑惑。have told himself 是让他自己知道的用法吗?

问题 it is related……用法疑问

Only a few years ago, it is related, as soon as envoys sat to dine, “stealth boasting” would start. 老师好，it is related在句子里是什么意思？

问题 bring与take的方向性

Tea was brought to Korea and Japan during the 6th and 7th centuries.专家老师，该句中用的是bring,能改用take替换吗？

问题 did sightseeing是什么用法

Kristin Diehl conducted a series of experiments on photo-taking to find out whether people enjoyed it when they did sightseeing.过去式did后面为什么用ing形式（有did doing句型吗）？

问题 when从句的时态问题

—Can I go to Beijing for my holiday, Dad?—You can when you _______ a bit older.A. will getB. getD. gotC.are getting为什么答案是选B而不是选A（本人初学者，不要太深奥）