Dear ...(name),
Thank you very much for inviting me to your birthday party, absolutely I'll come along as we didn't catch up recently. As I had such this party last week I have some suggestions to make it as memorable as we can. it is better to invite your close friends with a DJ and of course, it could be thoroughly enjoyable if you invite a singer. Moreover, you could cook out whether your party is at your place or it's somewhere else.
It is a birthday party so, normally we can have a party with friends. By inviting our friends you probably have a memorable time. I'm sure it would be great.
If you're going to do as I suggest, it is better to have it in a garden as it is far away from humanity and we needn't be worried about the neighbors.
I wish you the best and a happy birthday.
All the best,
...(name)

Dear .....[ tên ]
How are you? it's be a long time since we see each other. I'm really happy you came in guinea for holidays because next week, precisely Saturday morning we're going to have birthday party in my house . yeah you guess it will be my birthday party for my 15 years old. it will be fun and it'll be lots of fun and there'll be loads of people there like my classmates and grandma she's going to be very happy to see you. My house is on Samba avenue near a park. you will immediately recognize it because it the only house with many trees and red door. we're going to have cinema party so, bring popcorn or lemonade.
Hope you can come and see you sonnn!!!                                                                                              ............ [ tên ]