第一部分：說明寫信目的
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：提出建議
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：期盼回復
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(建議) helpful/ practical/ useful(有幫助的，實用的).
