Dear _______,
I am writing to express my views concerning_____(對象). In the first place, I would like to say thank you for the help and everything else you have been offering to us. Meanwhile, I also want to make some suggestions .
Firstly, we have found that_____(建議一). Secondly, we want to______(建議二) . Finally, we hope that _______(建議三).
I am looking forwards to your consideration about my proposals. Thanks in advance.
Yours sincerely,
Li Ming
作文要點點撥
concerning 關於，論及，就…而言：
the help and everything else you have been offering to us
你一直向我們提供的幫助及其它事情。
proposals 提議，建議
in advance 預先，提前
建議信寫作建議
首先，要表達你一直關注著某件事情，這件事情給你帶來了那些好處，同時針對不足，你想給出一些建議。 (這樣第一段基本上就完成了)
然後，針對具體的問題，給出具體的建議，一般是給出二到三建議就行了。(這裡真的只能是具體問題具體分析，沒有看到作文主題，老師也無能為力，提前幫你弄好。只能靠自己了，加油。)
最後，還是套路，希望認真考慮你的建議，表示感謝。