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问题 while做并列连词时前面必须有逗号吗

She thought I was talking about her daughter, while in fact I was talking about my daughter. 这是卷子上的一个句子，句子能看懂。请问老师 while 前面必须有个逗号吗？查了几个句子都有逗号。谢谢老师。

问题 you girls, they girls中人称代词的用法

You girls stand in the front row, will you?为什么用 you girls？那难道可有 they girls?反义疑问句为什么用 will you 结构？

问题 请教这里的分词是什么状语，又是如何判断的呢

Most of the Dominion populace accept Mengsk's rule, 【believing】 him to be the only leader capable of protecting them from the alien threats in the Koprulu sector.

问题 make sure 后面为什么用过去完成时

In future, I would make sure I'd checked out whoever was fitting it with their previous customers.请问 make sure 后面的从句中为什么用过去（完成）时而不用现在（完成）时？

问题 若过去的情况为客观事实该用什么时态

看到一个句子：The contribution of tourism to GDP was CNY1830 yuan in 2016.这里的 was，我有点理解不了。虽然2016是过去的时间，但是我是现在此刻在说一个客观事情，有必要用过去式吗？

问题 but的用法分析

... with an array of other disagreements, caused Trump to lose a respected Cabinet official who won widespread praise at home and abroad but who experienced increasing differences with a commander in chief known for his skepticism of American allies and military operations overseas.这里的but是并...

问题 worth与worth of的用法

老师好，下面句子里，Huge progress has been made against these diseases since an agreement in 2012 by pharmaceutical firms to donate billions of dollars’ worth of drugs. “billions of dollars’ worth of drugs”为什么要加worth of？直接说 billions of dollars’ drugs不行么？...

问题 bourgeois的是指中产阶级还是资产阶级

bourgeoisbelonging to the middle class中产阶级的interested mainly in possessions and social status and supporting traditional values追求名利且平庸的 supporting the interests of capitalism资产阶级的

问题 This was the crucial period which modern drinking

改错题，答案是在which前加in,可以把which改为when吗

问题 A year more到底是什么意思？

原句是The English language teaching sector directly earns nearly &1.3 billion for the UK in invisible exports and our other education related exports earn up to &10 billion a year more.网上对这个短语众说纷纭，感觉都不太对。

问题 句子分析

Two weeks ago, voters in Taiwan, the island democracy that Mr. Xi has made clear should join a greater China, resoundingly re-elected a president despised by Beijing. --此句子来自纽约时报，不代表我个人政治立场。that从句我理解为是修饰democracy的定语从句，但...

问题 even 与 even though/if 可以替换吗？

He was still enthusiastic for the scheme even in tiems of difficulty.例句中的even，可以用even though ,even if替换吗？ 另还问一下老师，for the scheme是句子的什么成分？

问题 一篇雅思作文里句子的疑问

Consider,for example,students who live in remote areas without roads or funds to pay for tuition to attend a school far away,an Internet connection solves this.（远程教育的好处）这个consider在这里做祈使句的谓语，students做宾语，就已经是完整的主句了，为什么逗...

问题 代词the others\others

-- Did all the students in your class pass the test?---- Some of them did. ______ didn’t.A. Another    B. The others    C. Some other    D. Others这道选择题作业帮中有的答案是B，有的答案是D ，如果班上有同学没有参加考试，是不是应该选D;如果全班都...

问题 have to可后接完成式表推测吗

I knew he was in. I think he had to have heard the knock.请问上面的句子对吗? have to可后接完成式表推测吗?