Hello Pete,
Thanks a lot for your letter. It was great to hear from you!
In your letter, you asked about my lessons. Usually, I have five lessons a day. My favourite subject is History because I like to learn about the past.
What about you? What do you usually do in your free time?
Write back soon!
Best wishes,
[Твое имя]
Ответ: смотри пример письма выше