独立主格和非谓语动词怎么区分啊?Judging from his appearance

这是主动的形式表示被动的含义,是特例,比如,他被证明是个小偷译为；
He proved (to be )a thief.而不是He was proved a thief.这就是主动表示被动的一种,你要学会积累,还有一种非谓语动词的特例,Worried about the child's saftey,the parents can't fall asleep.这里worry 和the parents就不是被动而是一种系表结构,因为我们说The parents are worried about the child's safety.其它的大部分都是表示被动的.独立主格结构有自己主语,这个主语和主句主语不一样,但是非谓语动词的主语和主句的主语是保持一致的.例如；The work finished,I went to bed.独立主格结构主语是the work,主句主语是I,不一样,the work 和finish 之间是被动所以用过去分词,又例如；Finishing the work,I went to bed.分句里finish 的主语和主句主语I是一样的,又是主动关系所以用现在分词,还不懂的话就上网再搜索着查查,