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问题 句末现在分词短语（其前有逗号）作什么成分

But tourism is double-edged, boosting the economy but damaging the environment. 请问上面句子末尾的现在分词短语作什么成分？如果是状语，那它是什么状语？

问题 有人在门口去开门如何区分用open还是answer

如果有人在门口，我们要去开门，看到有的人用 open the door，有的人用动词 answer the door。这有什么讲究吗？

问题 句子翻译（介词短语位置前后顺序）

...朋友住在加拿大。译文：He stayed in Canada with his friends all the way through high school. 请问，介词短语in Canada 和with his friends可否互换位置？变为：He stayed with his friends in Canada all the way through high school.句意是否发生变化？ 

问题 请帮忙分析下这个从句中where的用法

下面这句话来自课文。How about the trick where the puppy goes to school in your book bag?请问在这里 trick 是先行词吗？这句里为什么用 where 来引导从句？

问题 where可以做宾语从句的主语吗？

老师们好，我在小说里看到个句子I called Isaac, who cursed life and the universe and God Himself and who saidwhere are the goddamned trophies to break when you need them.said的宾语从句中可以有where作主语的情况吗？

问题 Coffee drinking和drinking coffee的区别

Coffee drinking is popular in the UK.Drinking coffee is popular in the UK.请教老师，Coffee drinking和drinking coffee的区别，都可以用在书面语作句子主语吗？谢谢老师。

问题 时间状语从句省略了主语的问题

Nonetheless, the potential for mobilizing toxic trace elements from the coalbed is an important factor to be considered when evaluating CO2 sequestration in deep unmineable coal seams.这个句子中when的后面直接接evaluating 而没有主语，时间转语从句也是句子啊，不应该有...

问题 这道被动语态题为什么不能选一般现在时

This coat _ for use in the rain only，but I wear it all the time.A.is intendedB.intendC.intendsD.will intend

问题 主系表结构中的表语划分存疑

The man is a policeman.请问老师这句话中的表语成分应该是policeman 还是a policeman?之前在语法书中看到The man 即定冠词+名词 可以看作名词短语作主语。然而a policeman是否也能看作名词短语作表语？

问题 lay bare在句子中的成分

比如这句话But a botched response to the virus would lay bare tensions inherent in the party’s hybrid claims to legitimacy.如果lay是谓语动词，那么bare作什么句子成分呢？是lay的状语吗？

问题 介词宾语从句中连接词使用问题

在介词宾语从句里，连接副词能不能引导？比如这句话：Shanghai did not originate from where the tall buildings are.这句介词宾从是连接代词who引导的，正确吗？we should appeal to who are living in those wealthy countries to donate money to the poor people.

问题 when-从句（突然）是否是时间状语从句

这when从句还能看作是时间状语从句吗?I was on the way to the gym when I thought an ice-cream would be nice.翻译软件把这个when翻译为突然, 那应该是副词吧? 这样的话, 它还能作为时间状语从句吗?

问题 句子主动与被动的问题

This novel concerns peasant life after the reform.请问上面的句子concerns用主动形态正确吗？ 很困惑，为什么concern有时候用主动有时候用被动呢，究竟是什么原因？比如：She needn't concern herself with so much unimportant details (主动)   ...

问题 “with+宾语+过去分词”类复合结构

If you are learning new words, it is wise to use small cards with the words written on them.资料上说，句子中的with the words written on them属于“with+宾语+过去分词”类型的with复合结构。但这里为什么用过去分词，可以用不定式或现在分词吗？

问题 介词like使用理解疑问

It is terrible. The cat miaowed a lot at night recently. It sounds like a baby crying.这句话，我有2个疑问：1) The cat has been miaowing at lot at night recently - 改成这样才更合理？2) It sounds like a baby crying. - 介词like后面应该是一个名词性质的词组，所以如...