Dear Mark,

how are you? I know it’s been a long time since we last wrote, but I’ve been very busy because of school and the Karate competition! It’s been a great experience to me and I hope to participate again next year. 
Are you still going swimming? Did you improve your breaststroke?
Today me and my friends were ready to go playing football in the park, but it’s raining, so I decided to write to you to overcome sadness. 
Please write me soon!