1、很多国家都存在环境问题。

Many countries have environmental problems.

Environmental problems exist in many countries.

敲黑板：

陈述句：谁干什么。 谁：名词    干什么：动词  

先结构再关系：把握句子主干，其他为修饰成分。

写作源于模仿，记住的意群越多，越native。例如：environmental problems、have problems、problems exist。

2、环境问题已经越来越严重。

Environmental problems have become increasingly severe.

Environmental problems are going from bad to worse.

敲黑板：

环境问题 environmental problems、environmental woes、 environmental issues。

3、出国留学可以让人学习外语。

Studying overseas allows people to learn foreign languages.

敲黑板：

allow sb to do sth=  enable sb. to do sth. 让某人做某事

study overseas/abroad 出国留学

doing sth. 做主语 谓语动词用单数

learn/acquire foreign languages 学习外语    不用 study 意为研究