We all left the police station,convinced that Tom was innocent.=
We all left the police station ,and we were convinced that Tom was innocent
我们都离开了警局,并相信Tom 是无辜的.
解析：convince
vt.使相信,说服,使承认；使明白；使确信；使悔悟,使认错[罪]
现在分词：convincing；过去式：convinced；第三人称单数：convinces
这是一个及物动词,和主句的主语是动宾关系,即是被动关系,故用过去分词做伴随状语.