1、投诉信
投诉信的开头常用句式和套话
I am writing to inform you that I am dissatisfied with your …
投诉信的结尾常用句式和套话
I understand you will give immediate attention to this matter.
I would like to have this matter settled by the end of …
2、询问信
询问信的开头常用句式和套话
I would be most grateful if you could send me information regarding/concerning …
I am writing to see if it is possible for you to provide me with information regarding …
询问信的结尾常用句式和套话
Your prompt attention to this letter would be highly appreciated.
