[解析]
Dear Peter,
I learned from the school website that you are looking for a classmate to be a table tennis coach. I'm writing to recommend myself to be your coach.(写信目的)
I am interested in table tennis when I was young. I began practise table tennis when I was 5 years old. I took part in the table tennis competition when I was in Grade 5, where I won the first prize.【高分句型一】 And I am outing and helpful too.Besides, I can speak fluent English, which means we shall not have barrier in communication. 【高分句型二】(自荐理由)
I think I have all the qualities of being a table tennis coach. I'm looking forward to your reply.(表达期望)
Yours sincerely.
Li Hua