先弄清楚自己的邮件是正式的还是非正式的，写法不同。
The reason for writing 要确认好信件格式
Enquiry (to ask for information)
Request (to ask someone to o something)
Apology (to say sorry) or complaint (to complain about a problem)
— I am writing to provie the information you requeste.
— Coul you possibly…
— I woul be grateful if you coul…
— I am writing to apologize…
— I am afrai that…
一.Informal letter（非正式信函）:
1.Beginning(开头): Dear + first name
2.Frienly greeting(寒暄): I hope this letter fins you well.
3.Contractions(写缩写): I'm, in't, couln't, there's...
4.Questions(丢出问题): Do you remember...? Why on't you...？
5.Exclamation(感叹): ...earlier than I thought it was!
6.Linking(连接词口语化): Well, Anyway, so, an
7.Phrases(短语口语化):ha a great time, couln't have aske for, working flat out, back to normal
8.Ening(结尾): Hope to see you soon + first name
二.Formal letter(正式信函):
1.Beginning(开头):Dear Sir or Maam
2.No greeting necessary(不用寒暄)
3.No contractions(不准用缩写！): I am, i not...
4.Normally avoi irect questions(问问题要客气):"I woul like" instea of "Can I have?"
5.No exclamation marks( 不要惊叹) (!)
6.Linking(连接词不要口语化): However, Consequently, an, also
7.Phrases an vocabulary(用词稍高级):with regar to, appliance, it was installe, the following ay, faile to (meaning "in't"), proceure, he assure me, report the issue, contacte, uner warranty, I am entitle to, replacement, phone me personally
8.Ening(结尾):I await your prompt response,Yours faithfully + full nameNote:Both letters also contain 'neutral' vocabulary that can be use in any type of letter. For example, I in't highlight wors like 'hosts', 'ealine' or 'assignment' because they coul be use in both formal an informal contexts.
有用表达：
Openings(开头):一般都是Dear+人名
The stanar opening for formal corresponence is Dear:
关系亲密的话就直接"Dear+人名（Dear Cook,) ". 关系不很亲密的话就要用"Dear+姓（Dear Mr. Cui,)".女性不知道是否结婚的时候就用"Ms."。不知道姓名的时候可以用Dear Sir or Maam或者To Whom It May Concern
常见的：
Dear sir
Dear Mr.
Dear Maam
Dear Mrs.
Dear Sir or Maam
Dear Ms.
Dear Sirs.
