过去分词与现在分词被动式的区别
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过去分词在被动的同时,还表示完成,而现在分词被动式在被动的同时,还表进行.

Built in 1501,the bridge is over 500 years old.这座桥建于1501年,已有五百多年的历史.

Who is the woman being operated on?正在动手术的女人是谁?

但有时它们也可表示相同的意思.如:

Written in haste,the book has many mistakes.这书因写得仓促,所以错误不少.

Being written in haste,the book has many mistakes.这书因写得仓促,所以错误不少.

Having been written in haste,the book has many mistakes.这书因写得仓促,所以错误不少.

有时虽然所表示的时间概念相同,但有细微区别:

Having been show the lab,we left.被领着看了实验室后,我们就离开了.

Shown the lab,we left.被领着一看完实验室,我们就离开了.(有一种急促感)