被动语态求翻译~~~~

题目

被动语态求翻译~~~~
1、必须采取措施来防止河流受到污染（measure）
2、你能告诉我这个包是谁的吗?（belong to）
3、你很难想象在过去十年里上海发生的巨大变化（happen）
4、我觉得这门语言很难掌握（difficult）

答案

1.Some measures must be taken to protect the river from polluating.
2.Can you tell me whose this bag is belong to
3.It is hard for you to image the great change that happened in shanghai last decade.
4.It is difficult for me to study this language.
第三和第四句不是被动,它是一种很重要的句型,你一定要掌握这一用法.