one of the countries with fastest growing outbound tourists 

不知道这里的fastest作副词还是形容词 我一开始以为是副词，因为觉得它省略了the 

解答如下

fastest 为副词fast最高级，修饰现在分词growing 

今天碰到了这个短语 one of the fastest growing sectors of the tourists of the industry 突然觉得fastest又可以做形容词解，更困惑 修饰动名词呢？ 

Loud  chatting is rude.(形容词用法） 

chatting loudly is rude. （副词用法）

语法书上对副词修饰分词的讲解也甚少…

loud

(1)adj.  响亮的，大声的，高声的; 响亮的，洪亮的，高亢的; 高声的，激烈的; 刺眼的，太招摇的;

There was a loud thump as the horse crashed into the van.  

马撞在货车上发出砰的一声巨响。

Mr Jones received loud support from his local community.  

琼斯先生获得了他所在社区民众的热烈支持。

(2)adv.  大声地，高声地，响亮地;

Now don't talk so loud and bother him, honey.  

亲爱的，好了，别这么大声说话打扰他。

loudly adv.  高声地; 吵闹地; 响亮地; 花哨地

The officials felt taken for granted and grumbled loudly.  

这些官员感到受了怠慢，于是大声抱怨起来。

He laughs loudly when I accuse him of fibbing.  

当我指责他说谎时，他大笑起来。