Seeing as many of our friends as we can尽可能多的看我们的朋友,这句话应该不是一个完整的句子查了一下,原句应该是这个吧:We often just walk around the town center, seeing as many of our friends as we can.我们通常会在小镇中心四处走走,尽可能多地见到更多朋友。这句话中前一半是主句,后一半seeing是非谓语动词形式充当状语
seeing是动名词,用来做主语