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问题 when 和 while 的区别与互换

Think about rocks when you enjoy the sand and sun. 这句话中的when能用while 吗？

问题 可否直接说estimated £30 million

The bequest is con-servatively estimated at £30 million.请教老师，estimated 后为何要用介词at？除了介词at，可否用其他介词？谢谢老师。 

问题 是否是强调句的分析与判断

It's people with the dirty mind that think like that.请问这个属于强调句吗？能分析一下吗？

问题 tatty的用法疑问

Keep a tatty of how many cars enter the lot each hour. 记录一下每个小时有多少辆汽车进入该停车场。这里的 tatty 是什么用法? 查词典它是形容词，意思“破烂的，破旧的”，但这个句子好像是名词。tatty可以用作名词吗？ 

问题 现在分词短语是作宾补还是后置定语

I'm having a seriously hard time getting used to the fact that summer is over.

问题 不定式做定语还是目的状语

The data entered must pass these rules to be considered valid.还是不是很能容易的分清不定式做定语还是目的状语？请老师详解！

问题 被动和伪被动区别

Increasingly both Houses were called to agree to taxation. 第一句是被动吧？ The economic causes were connected with Flanders. 第二句伪被动？ connected已经在此处是完全形容词词化？

问题 请教一句从句

关于图片当中的第2句话想请教两个问题，1.which is crystal clear.是否是修饰blue water的定语从句？2.这句话中为什么要出现一个which？为什么不可以写成It's name already indicates the blue water is crystal clear.呢？

问题 比较状从省略问题

The new designed bedroom seems to be great deal large than _______.A it is necessary B being necessary C to be necessary D is necessary 请问这里是怎么省略的？

问题 Nobody else的用法

“You can use me as the last resort, and if nobody else volunteers, then I will do it”nobody else为代词，定语修饰后面的volunteers，这里的volunteers为什么要用复数呢？单数是否可以？

问题 语法分析：was done doing

The monument was constructed using marble from different states to symbolize unity after a divisive Civil War.was construed using是什么句型？

问题 用于句末的 particularly 是什么用法

Sandra has become a style icon, for the fashion world particularly.请问专家，用于句末的 particularly 是什么用法？

问题 hard的修饰问题

Karipidis said that having more cellphone towers actually reduces the amount of radiation emitted from cellphones, because they don't have to work as hard to get a signal.这句话的work as hard的修饰关系是什么？

问题 during fever为什么没有冠词

下面这个句子来自网络：During fever a large quantity of fluid is lost in perspiration. 发烧时，大量水分会通过排汗而丧失。请问：为什么 fever 前面没有冠词呢？

问题 独立主格结构是否可以自带状语从句

They both breathe in deeply, others laughing as they do so.请问各位老师others laughing as they do so是否可以看做是独立主格结构自带状语从句? 其他分词短语作状语是否也可以自带状语从句?