第一个句子,相当于:as we lay relaxed and (lay) dreaming,这里relaxed和dreaming都是分词作lay的状语第二个句子,相当于:Soon I was back on my feet again and (was) following him.这里的following him和back on my feet一样,都是作为was的表语。and 连接的两个并列成分,假如动词有重复,一般都是省略的