comparing with 和 compared wiht 和to compare with 和having comp

comparing with 现在分词短语表主动,说明compare这个动作是它的逻辑主语发出的．
compared with 过去分词短语表被动,说明逻辑主语是compare这个动作的承受者．
to compare with 动词不定式,在句中状语,常表目的．
having compared with 强调compare这个动作的完成．