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问题 现在分词前用不用逗号的区别

They came into the classroom, surrounding their teacher.He saw a man coming towards him.老师您好：这两句话我有两处疑问。① 为什么一个加逗号，一个不加呢？② 这两句的非谓语：surrounding their teacher 以及 coming towards him  动词用ing形式到底...

问题 as 引导的事时间状语从句还是原因状语从句

As we joined the big crowd, I got separated from my friends.as 这里引导的是哪种状语从句？我个人是觉得原因状语从句，因为我们加入了拥挤人潮，所以我和朋友被分开了。

问题 为什么引导同位语从句的that可以省略

The way products are displayed is another difference between supermarkets and many other types of stores.这里 prodcuts are displayed 应该是 way 的同位语从句吧？，为啥可以把that省略掉？

问题 a course to assist中的to是副词吗

a course to assist adults to return to the labour market成人重返劳工市场的辅导班老师，a course to assist，to是副词吗,什么用法？

问题 非谓语短语动词的相关逻辑关系

I couldn't help laughing.You finish reading the book.I practise running every morning.I enjoy listening to music.老师，这样的句子对吗，如果动名词是不及物动词呢，为什么I need to sleep.不定式的逻辑就通，动词名一定要及物动词的吗？英语的逻辑思...

问题 too great a financial burden的用法

The heavy tax is too great a financial burden for us.老师，too great是作状语修饰后面的短语,在一句完整的主谓宾或主系表结构中，分枝(短语，词组，句子等)在句子里要么补充成分，要么修饰成分，是这样理解吗？

问题 Up by与Up表示“上升”时的区别

老师好，当使用up表示提高时， Up by 30%为上升30%；   Up to 30%上升至30%， Up是否可以直接加百分数呢？如果有这个用法这里的Up 是什么词性呢？  如 the profits is up 30%.辛苦老师解答！

问题 表示职位的名词前面加不加介词的问题

A supporter of Julius Caesar, he was appointed one of the triumvirate after Caesar's murder.通常我们都知道sb be appointed as ...为什么这里as省略了呢？

问题 (a medical record) Pulmonary: Breath sounds are e

Does“with good air entry and exit”means the pulmonary ventilation is good?

问题 定语从句中，关系代词that和who如何辨析？

Granted, you're not the pronunciation expert that I am. But you have been speaking English longer than I have.上句中的that I am 定语从句不可以换用who作关系代词吧？为什么呢？

问题 这句话的结构很难理解

But the winner-takes-all nature of technology markets means those that succeed often do so extravagantly.老师您好，这句话的主语是winner-takes-all nature谓语动词是means 宾语是一个those作先行词，that引导的定语从句，且到succeed戒指，那如果这样理解的话...

问题 I wait for for an hour...这样可以吗

He is the man who / whom / that  I waited for for 3 hours. 这里不提前for， 连用两个for 自然吗？

问题 see sb as doing sth中的as

He saw himself, perhaps, as inviting his students to start an exciting voyage into an unknown world invisible to the eye.这句话中的as是什么意思呢？可以去掉吗？

问题 whether to be hopeful... 这里是否可以省略

曾看到这样一句话：The principal’s inbox has been flooded with emails from students wondering whether to be hopeful about a new teacher. whether to be hopeful... whether后是否有省略，可不可以这样用呢？

问题 系表结构中的不定式（反射不定式）作什么成分

The book is interesting to read. 问 to read 这个不定式该如何分析其成分？