第一部分：说明写信目的

　　You have asked me for some advice on how to improve…. I will try to give some useful suggestions.

　　I am writing to you to present what I think on the further improvement of … so as to…

　　I would like to make a recommendation that…

　　I am writing to advise you of…

　　第二部分：提出建议

　　I'd like to suggest that…

　　May I suggest that…

　　Could you please…

　　Why don't we…

　　In my opinion …

　　I feel that it would be beneficial if…

　　第三部分：期盼回复

　　Thank you for your attention.

　　Please take good consideration of my advice. Thanks.

　　I trust you will take my suggestion into account.

　　I hope that my suggestions are helpful for your decision-making anyway.

　　I hope you will find these suggestions/ proposals/ recommendations(建议) helpful/ practical/ useful(有帮助的，实用的)