I. 常用短语：

neither ... nor ...; by the way; what' s more; except for; for one thing; for another ...

II. 常用句式：

★ I am writing to express my dissatisfaction / disappointment with ...

★ Excuse me, I think you've given me the wrong ...

★ Excuse me, but there is a problem / something wrong with ...

★ I would like to draw your attention to the problem / fault ...

★ I'm glad to ..., but I'm sorry ...

★ I understand it's not your fault, but ...

★ If you can help me ...

★ I hope you can give enough attention to this matter and ...

★ I would be grateful if you could ...

★ I would like to get this matter settled as soon as possible and ...

【范文欣赏】

Dear Sir or Madam,

　　I'm writing to tell you something about the MP4 player that I bought from your website last week.

You claim in your advertisement that the storage capacity of the player is 4GB. But I'm disappointed that it is not true, because it reads "The disk is full" just after I put two movies which are less than 3GB on it. Besides, the screen is also