信件1：

　　Dear Sir or Madam,

　　I am writing with regard to a ?ight that I missed due to a mistake by one of your employees.

　　Two weeks ago I was due to catch a ?ight to Rome, where I intended to spend four days on holiday. Unfortunately, the attendant at the check-in desk gave me a boarding card for a different ?ight, and I did not notice the mistake until I arrived at the departure gate and it was too late.

　　As a result of the error, I was not allowed to board the ?ight to Rome, and this caused me great inconvenience. I had to book a new ?ight two days later, which meant that I missed two days of my holiday and I spent an extra ?200.

　　As the mistake was caused by your company, I hope that you will compensate me for the cost of the additional ?ight, as well as for my taxi fares to and from the airport.

　　I look forward to receiving your response.

　　Yours faithfully,

　　Paul Jones

　　信件2：

　　Dear John,

　　I’m just writing to let you know that I’ve moved house.

　　As you know, I went for an interview for a job here in London. Well, they gave me the position! It would have been impractical to travel down from Manchester every day, so we’ve found a house here, in a nice part of London called Greenwich.

　　Our new house isn't ideal. London prices are crazy, and we were only able to afford a one-bedroom ?at. But on the bright side, it’s on the ground ?oor, it’s got nice big windows, and a lovely view out onto the garden.

　　If you ever fancy a trip to London, you’re more than welcome to come and stay. It would be great to see you. From where we live, it’s only a quick ride on the underground into the city centre, so we could do some sight-seeing together.

　　Keep in touch!

　　All the best

　　Mike

　　答案是第一封正式，第二封非正式。理由如下：

　　Formal letter

　　正式信件

　　Beginning: Dear Sir or Madam

　　用Dear Sir or Madam开头

　　Stating the purpose: I am writing with regard to

　　用“I am writing with regard to”说明目的

　　Formal choice of language: due to, I intended, as a result of, caused me great inconvenience, compensate me, the additional flight

　　使用以下正式词汇：due to, I intended, as a result of, caused me great inconvenience, compensate me, the additional flight

　　No contractions: I am (not "I'm")

　　不使用缩写：写成I am而不是I'm

　　Ending: I look forward to receiving your response. Yours faithfully,

　　结尾： I look forward to receiving your response. Yours faithfully,

　　Informal letter

　　非正式信件

　　Beginning: Dear John

　　用Dear John开头

　　Stating the purpose: I'm just writing to let you know that

　　用“ I'm just writing to let you know that”说明目的

　　Informal choice of language: As you know, Well, prices are crazy, on the bright side, it's got nice big windows, a lovely view, if you ever fancy, great to see you

　　使用以下非正式词汇：As you know, Well, prices are crazy, on the bright side, it's got nice big windows, a lovely view, if you ever fancy, great to see you

　　Use of contractions: I'm, we've, isn't, it's

　　使用缩写：I'm, we've, isn't, it's

　　Ending: Keep in touch! All the best

　　结尾：Keep in touch! All the best