(1)过去分词作状语:同动词-ing形式作状语一样,过去分词的逻辑主语是句子的主语,如是被动关系,又与谓语动词同时发生,或无一定时间对比,用过去分词,如:Seenfromthetopofthemountain,thelakelookslikeamirror.(相当于Thelakeisseen)相当于Whenthelakeisseenfromthetopofthemountainitlookslikeamirror.Heated,watercanturnintovapor.相当于Ifitisheated,watercanturnintovapor.(2)过去分词作表语:Weareinterestedinscience.(3)过去分词作定语:过去分词作定语,有时间要求,发生在谓语动词之前,即完成的动作,用done,而不用havingbeendone.Thebridgebuiltlastyearis2kilometerslong.Peopleinvitedtothepartyaremostscientists.(4)过去分词作宾补:Inoticedthecarrepaired.