I am writing to express my views concerning... 我写此信来表达我关于……的观点。

 　　You have asked me for my advice about...，and I will try to make some conducive suggestions. 对于你来信问我关于……的事，现提供几条有益的建议。

 　　I would like to suggest that... 我建议…… 

　　Why not.../Why don't you...?为何不……? 

　 　I think it will be a good idea/more beneficial if you could... 我认为……是个好办法/有利的。

 　　It's important to.../It helps to...It should be a good idea to... 很重要/有帮助/是个好主意。

 　　I am writing to put up some suggestions concerning... 我提出几条有关于……的建议。

 　　Please take good consideration of my advice.Thanks. 请仔细考虑我的建议，谢谢。

 　　I hope you will find these proposals/suggestions/recommendations helpful/useful. 希望这些建议对你有帮助。

 　　Thank you for your attention. 感谢你对此事的关注。