1) 和have一起构成完成时态或构成非谓语动词的完成形式。* My mother has taught English for twenty years. 我妈妈教英语教了20年。* When I got to the airport, the plane had taken off. 我到达机场的时候，飞机已经起飞了。* The house was to have been ready today. 这房子本该今天竣工的。* Having suffered such heavy pollution already, it may now be too late to clean up the river. 这条河已经受到很严重的污染了，现在才来清理可能太晚了。
2) 构成被动语态或非谓语动词的被动形式。* My homework has been finished. 我的作业完成了。* They were sentenced to death. 他们被判了死刑。* The room is being built. 房间正在建设当中。* He was said to have been arrested. 据说他被捕了。* These are the problems to be discussed at the next meeting. 这是下次会议要讨论的问题。
3) 作表语 * Please remain seated. 请不要站起来。* He seemed embarrassed. 他似乎很尴尬。* The question still remains unsettled. 问题仍未解决。
4) 作定语a) 前置定语 * The injured workers are now being taken good care of in the hospital. 受伤的工人现正在医院受到良好的照料。* They are cleaning the fallen leaves in the yard. 他们正在打扫院子里的落叶。
b) 后置定语过去分词短语或单个的过去分词可以作后置定语* Is there anything planned for tomorrow? 明天有什么活动吗？* The suggestion made by the foreign expert was adopted by the manager. 外国专家提出的建议被经理采纳了。* This is a letter written in blue ink. 这是一封用蓝墨水写的信。* Is there anything unsolved? 有什么问题没解决的吗？ * The persons involved were all killed by an unknown killer. 牵涉其中的人都被神秘杀手杀死了。
3) 作复合宾语a) 动词 + 名(代)词 + 过去分词* I must get my bike repaired. 我必须要修理我的自行车了。* He was trying to make himself understood. 他正在努力使人们明白他的意思。* When will you go to the hospital and have your tooth examined? 你什么时候去医院检查你的牙齿？* I want the plan carried out next year. 我希望明年可以执行这计划。* Please keep us informed of the latest development. 请随时让我们知道最近的发展动态。
b) 介词 with + 名(代)词 + 过去分词* The girl sat there with her hand tied back. 这个女孩坐在那里，双手被捆绑在后面。 * With the homework finished, he was allowed to watch the football match. 完成作业之后，他被允许看足球赛。
4) 作状语a) 过去分词作状语可位于句首，句末或插入在句子中。* Given more time, we could do it much better. 多给点时间，我们会做得更好些。* The professor came in, followed by a group of young people. 教授走进来，后面跟着一群年轻人。 * Mr. Green, deeply moved, thanked us again and again. 格林先生深为感动，一再向我们致谢。
b) 有时单独一个过去分词也可作状语* Heated, water changes into steam. 水加热时就会变成水蒸气。* She turned away disappointed. 她走了，心里很失望。
c) 过去分词可与连词连用作状语。* Once published, this dictionary will be very popular. 一旦出版，这本字典将会很受欢迎。* When asked why he came here, the boy kept silent. 当问及为什么来这里时，男孩就保持沉默了。* Jane is a shy girl and she never speaks until spoken to. 简是个害羞的女孩，别人开口和她说话之前，她从不说话。* Although published many times, the book still sells well in the market.
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