Question

一个英语句子结构 求分析成分谢谢！

“Citizens of many countries are expressing concern about the environmental damage caused by the widespread release of greenhouse gases, damage that may be impossible to reverse.”这句话中的“,damage that may be impossible to reverse.”在句子中做什么成分？

Answer 1

“Citizens of many countries 是主语are expressing 是谓语concern是宾语 about the environmental damage caused by the widespread release of greenhouse gases,是介词短语作定语。其中caused by...是过去分词短语作定语。 damage是前面environmental damage的同位语 that may be impossible to reverse是定语从句.”
本句也可以表达为
Citizens of many countries are expressing concern that the environmental damage caused bythe widespread release of greenhouse gases may be impossible to reverse.则that 引导的是同位语从句。

追问

那作为同位语的这个damage用逗号和主句隔开是属于什么用法呢？

追答

是为了补充说明，所以用逗号隔开

Answer 2

Citizens of many countries主语；are expressing谓语；concern宾语；about the environmental damage宾补；caused by the widespread release of greenhouse gases过去分词短语作定语，修饰前面的damage；damage that may be impossible to reverse 这里与前面damage是并列成分，同为concern宾补 ，that may be impossible to reverse定语从句，修饰damage。