Dear David
I am writing to you because I read your E-mail on the internet that you want to have Chinese pen friend.I'd like to be your pen friend because I think we have the same interests- playing basketball,traveling,liking pet dogs and so on.I am a middle school student like you so that we can share our experiences.I am good at Chinese so I can help you with your Chinese and you can help me with my English.We can learn more about our country.I am looking forward to hearing from you soon.
Yours
Li Hua