不定式、现在分词为主动.如：
To learn English well,we should .【we为to learn English well的逻辑主语】
Having lived abroad for many years,the old man.【the old man为having lived abroad for many years逻辑主语】
过去分词表被动.如：
Questioned for several times,the thief.【the thief为questioned的承受着】
祝你开心每一天!