假设你是李华，你所居住的城市环境变得越来越差。请你给市长先生写一封信，请求市长关注，简要说明存在的问题，并提出自己的建议。

第三步：连词成句
1. I am writing about the environmental pollution in our city.
2. And when trees are cut down some animals disappear.
3. People’s health has been greatly affected by air noise and water pollution.
4. In short, it is our responsibility to protect our city.
5. I would be grateful if the government could take some steps to solve this environmental problem.
根据提示及关键词（组）进行遣词造句，注意主谓一致和时态问题。
第四步：连句成篇（衔接词）
1.表文章结构顺序：First of all, Firstly/First, Secondly/Second… And then, Finally, In the end, At last
2.表并列补充关系：What is more, Besides, Moreover, Furthermore, In addition As well as, not only…but (also)…, including,
3.表转折对比关系：However, On the contrary, but, Although+clause(从句), In spite of+n/doing
4.表因果关系：Because, As, So, Thus, Therefore, As a result
连句成文，注意使用恰当的连词进行句子之间的衔接与过渡，书写一定要规范清晰，
第五步：润色修改
【点睛】范文内容完整，语言规范，语篇连贯，词数适当。作者在范文中使用了较多高级表达方式，如And when trees are cut down, some animals disappear.运用时间状语从句；In short, it is our responsibility to protect our city.运用形式主语it，后面的不定式是真正的主语。全文中没有中国式英语的句式，显示了很高的驾驭英语的能力。另外文章思路清晰、层次分明，上下句转换自然，为文章增色添彩。