провреьте пожалуйста мое письмо написанное на урок английского языка

Как переводчик могу сказать что здесь очень много ошибок

Я бы написал так:

"Dear Jane!
Thank you very much for the letter. Sorry I hadn’t written for so a long time, I was too busy dear. The summer 2011 start have happened just like year before. After the exams and the hard school year, I had decided to take a break and go south for a kind of relaxation.
I spent my summer holidays at the Berdyansk Spit. There were so many things to do there! I've got a lot of friends over the summer. Every day was full of small pleasures. We had sunbathing on beach and swam in the Sea very often. Water was very warm because as you probably know Azove Sea is not so deep. We went to catch shrimp. And we prepared it after that together. The ones who slightly spoiled a pleasure were annoying insects.I also visited the Water Park. Admittedly my summer holidays weren’t too much outstanding, but I'm gonna remember them and look forward to the next ones.
Sorry I have to go now. Write as soon as you can, please.
Sincerely yours Den"

Главная ошибка в несоблюдении времен. Если повествование идет в прошедшем времени, то все глаголы должны быть в прошедшем