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问题 下文的21 percent为什么放在了of的后面

a whiff below the normal amount in breathable air of 21 percent正常的百分比应该是放在of的前面，在这里为什么会放在of的后面？谢谢老师。

问题 warn sb of/about sth

We warned our children of/about the dangers of playing in the street.Janet warned me about the water. She said it wasn't safe to drink.这两个句子中 warned 后面所接介词为什么有区别? 是warned of和warned about在意思上有什么区别吗?

问题 可以不用所有格of，随意拼凑名词+名词吗

一般我们不会的词，我都会用of拼凑，那么能不能直接去掉of，换成名词+名词，这样是不是会不符合外国习惯？因此要去单独背诵名词+名词的固定形式？比如 results of analysis=analysis results，这种就可以的，是不是只要逻辑合理都...

问题 As if 的陈述式和虚拟式

...去事实相反，用过去完成时；表示将来的可能性不大，用would (might, could)+动词原形. 第一组:现在时He walks as if he is drunk. (他现在已经醉了)He walks as if he were drunk. (他现在没醉) 第二组：过去时He walked as he was drunk. (他过去的...

问题 of which引导的定语从句

No immediate constituent may function in a manner equivalent to the construction of which it is a part. 老师好！这里的of which是等于where吗？

问题 本句中的only修饰的是谓语动词还是because of ?

...ng on the ground may only have become an option in the first place,because of one key event: the extinction of dinosaurs.本句中的only是修饰谓语动词 may have become 还是修饰because of ?感觉从句意上理解应该更接近于后者，上面这个句子如果改为Living on the ground...

问题 a unique concentration of的理解

Angkor was the center of the KhmerKingdom. With impressive monuments, several different ancient urban plans and large water reservoirs, the site is a unique concentration of features testifying to an exceptional civilization. 这里的 a unique concentration of 应该译成“罕见的遗址聚集...

问题 a cluster of + 复数可数名词，谓语动词单复数问题

请问老师：1 a cluster of 和 clusters of 后面是不是只能接复数可数名词？2 a cluster of + 复数可数名词，谓语动词只能用单数吗？

问题 a mass of...作主语时的主谓一致问题

A mass of people ______ gathering in front of the factory.A. was    B. werea mass of...作主语时谓语动词是用单数还是复数？

问题 a series of…作主语谓语动词用单数还是用复数

人教版高中英语必修一第一单元有个短语:a series of(一连串的;一系列;一套)。请问当 a series of... 用作主语时，谓语动词用单数还是用复数。如下面一句用的是复数 have，可以用单数 has 吗?A series of attacks have sharpened fears of more violenc...

问题 most of +名词是否名词前是否需要加特指限定词

...限定词，如果是名词的话就需要加上。如以下例子：Most of them;Most of the students;如果当名词有其他特指词限定时是否还需要加the来限定呢？Most/all of Tencent applications. (腾讯大部分应用产品) 还是说这里应该是Most of Tencent's appl...

问题 one of money 是什么用法

The problem is not reducible to one of money. one of 后面不是要接复数名词，这里怎么接了不可数名词呢？

问题 cast of characters的理解问题

cast of characters 是演职人员表的意思。cast 表示全体演员；character 表示人物、角色；两者被 of 连接后这个从属关系我就闹不明白了。

问题 of所有格与名词属格

请问老师们，为什么今日报纸要说today's news paper,而不说newspaper of today呢？不是说无生命物体一般用of所有格吗？

问题 关于 in 和 of

The regrowth in plants also brought back many animals to the land. This return of life to Glacier Bay is why it is sometimes called "a land reborn."请问老师，句中的介词 in 和 of 可以互换吗？