Răspuns:
Dear Friend,
As you know my friend, I have been really happy over the past few weeks. And, I am going to inform you that my sister is getting married, you wont believe it! The even is near a big beautiful lake and, the hotel is on Flower's District 45. I really hope you will come at the marriage of my sister!
With happines,
Your friend.
Explicație: 1. your friend, 2. it is a formal letter, unless you are very good friends with the person. 3.it should be having only one paragraph as long as it's a letter. 4. I could try and be very happy and act really full of energy.