Отвечая на письмо Артура, можно оформить его следующим образом:
From: Russian friend@mail.ru
To: Arthur@friend.uk
Subject: Re: Books
Dear Arthur,
Thank you for your letter! I'm glad to hear that you've started a new book. I enjoy reading fantasy and adventure novels, especially works by J.K. Rowling. She's one of my favorite writers.
I usually borrow books from my school library because I love discovering new stories there. Sometimes, I also buy books, especially when I find something interesting that I want to keep.
I look forward to hearing about the book you're reading!
Best wishes,
[Ваше имя]
В этом письме мы ответили на все три вопроса Артура, сохранив дружелюбный и вежливый тон.