Dear Xiao Ming, I'm glad to receive your letter. In your letter you asked me about how to learn English well. I think you must listen carefully and be active in class. Speak as much as possible. Don't be afraid of making mistakes. You'd better read widely and learn some important parts by heart. You should practise writing often. Of course there are many other ways. You can also see English films, learn to sing English songs or make penfriends with foreigners. They are all very helpful. Nothing is difficult if you put your heart into it. I'm sure you'll learn English well.
Yours,
Xiao Hua