Past participle used as Adverbial & Attribute
过去分词是非谓语动词的一种形式,表示完成和被动的动作。它在句子中可以充当状语、定语等成分。
I. 过去分词作状语
1. PP作时间状语,相当于一个时间状语从句有时过去分词前可加连词when或while来强调时间概念。
When heated, ice will be changed into water.
When it is heated, ice will be changed into water.
