Formal
opening statements
1. I am writing this letter with regards to the scholarship program to study at London University which I read in Sunday Times on December 1st, 2014.
2. I am writing in connection with my recent stay at the Four Seasons in London, England. Due to a malfunctioning heater in my room, I spent three miserable nights at your hotel from April 26-29, 2010.
3. I am writing to complain about ...
4. I am writing in response to ...
5. I am writing to express my dissatisfaction with ...
6. I am writing to express my gratitude for ...
closing statements
1. I would like to thank you in advance for ..
2. Thank you for giving your attention to this complaint/matter.
3. I look forward to your reply.
4. I would be grateful if you could/would ...
Semi-Formal
opening statements
1. I'm just writing to say thank you for the offer of joining your company.
closing statements
1. I would be very grateful if you could allow me to take these four days off as it is very important to my parents.
Informal/Personal
opening statements
1. It's been so long since we last were in touch but I haven't forgotten all the wonderful times we spent together last year. It's my birthday coming up and I want to invite you over to stay at my place for the celebration.
2. I just thought I'd like o let you know that I finally quit my job ...
3. I'm writing to tell you about .......
4. I thought you might be interested to know/hear that ......
5. I thought you would like to hear about .......
closing statements
1. I can't wait to hear all about ...
2. Write back soon with your news
3. Let me know if you need .../want ... / are able to visit ...
4. I'm looking forward to hearing al about ...