Dear Jill,
Thank you very much for your letter.I want to be your penfiend,too.
My name is(Твое имя)and I am a schoolgirl.I am 10 yers old and I am in the fourth form.I study at comprehensive school .I live in (город или страну).
This summer I was at the seaside.We bathed and lау in the sun on the beach.The weather was fine.It was sunny.The sea was warm.I spent my last summer holidays very good.Do you like your summer holidys?
Write to me,
Best wishes,
(Твое имя).
Если нужен перевод,могу написать!