faced with difficulties, they never give up but try their best to find a way out

faced不是形容词,而是分词作状语,“面对困难”这句话实际上是主动的,可是为什么用了被动?很简单,因为它来源于系表结构be faced with.至于那个try,因为but前含有实义动词do,所以后面要用动词原形.interested也是分词作状语,来源于be interseted inbe interested in中interested是过去分词吗是的啊。如果不懂得话可以搜一下分词作状语的相关知识，详细了解一下。