过去分词作状语 being taught是现在分词的被动式，这里是“强调动作正在进行”相当于：Because B was being taught by A，B made great progress.如果是只用过去分词taught by A就相当于：B was taught by A，so B made great progress.或B had been taught by A，so B made great progress.这里只交待taught动作，而不强调进行.
过去分词做状语 1.Written in a hurry，thisarticle was not so good。因为写得匆忙，这篇文章不是很好。2.Lost/Absorbed in deep thought，he didn't hear the sound. 因为沉溺于思考之中，。
过去分词作状语的用法 过去分词作状语，表示被动或完成.如：Seen from the hill，our school looks beautiful.从山上看，我们的学校显得更美丽了.这句话的主语是our school，状语里的动词是see，学校和看的关系是学校被看，表示被动，用过.
