Dear Mr.Smith,
I've read your advertisement for an assistant teacher for a children's winter camp. I'm quite interested in this job. So I am writing this letter to recommend myself.
I am Li Hua. I am very outgoing and responsible. Besides, I can get along with children. And I can help them solve problems. More importantly, I have a good knowledge of English. I am good at spoken English, which makes it possible for me to communicate with others. So I can work with native teachers from England. Although there is only has English class, I will make the children happy. I have plenty of vacation time. I can start working this month. So don't worry, I can work on evenings and weekends for two weeks.
I would be grateful if you could give me the chance.
Yours sincerely,
Li Hua