过去分词在句中不可以作谓语，它相当于形容词和副词，在句中可作表语、宾语、状语、补足语等。

过去分词作表语
Never touch an electric wire when it is broken
He is gone
You are mistaken
过去分词作定语
The child gave a cry and with outstretched arms ran forward 那孩子叫了一声，伸开双臂向前跑去
Her job was to take care of the wounded solder ?
用作宾语的过去分词多用于表示已完成的动作，但是有时它所表示的动作却尚未完成或有待于将来完成
The workers demand increased wages 工人们要求加薪
过去分词用作定语亦可放在其所修饰的名词后面，其常具有暂时性，其动词的性质较强。

He wants his eggs fired (尚未炸好的。

Fried eggs 则译为炸好的鸡蛋带有永久性）
He himself took all the letters written to the post 他亲自将写好的信付邮（written = that he had written , written letter 则译为书写的信，非打字的信件）
过去分词短语用作定语时，一般皆置于所修饰的名词之后，其意义相当于一个定语从句
The ship battered by the storm crept into the harbour 被暴风雨击打的那只船慢慢的驶入港口
过去分词短语亦可用作非限制性定语，前后常有逗号
Some of them , born and brought up in rural villages, had never seen a train 他们中有些生长在农村，从为见过火车。

过去分词作这状语
过去分词从表面意义角度也可以用作状语表时间、原因、条件、让步、方式或伴随情况。

Heated , the metal expand (表时间）
Born and bred in the countryside,he was bewildered by the big city 他们生长在乡下，对这大城市感到迷惑（表原因)
Mocked by everyone ,he had my sympathy(表让步）、
The lichens came borne by storms这地衣是由暴风雨带来的（表伴随）
Seed catalogues are comprehensive , lavishly illustrated in colour 种子的目录册很全，用彩图表示的（表方式）
过去分词用作补语
用作宾语补语，其前的谓语动词多是感官动词和使役动词
He heard chain and bolts with drawn 他听见门上的链和栓被拉开了
She found the house renovated她发现房子已经修过了。