我想要一份推荐信，出国留学用的，是以老师的口吻写的，推荐学生在学校的活动和工作情况，谢谢！！

这里有个为高中生写的推荐信，我觉得很全面、语言诚恳有感染力，你可以参考。
Sir or Madam:
It is a pleasure for me to provide an evaluation in support of the application of Mr. Cai Yubiao, whom I have known for six years and taught English for three years in middle school. Later I acted as counselor of his class and he became my friend. I have full understanding of him in many aspects and I can say responsibly that he is a rare excellent student our school has produced.
Mr. Cai impressed first of all with his distinguished scholastic performance and his all-round development. He is almost a hero-like character on the campus. He is widely recognized, for his rank of always being one of the top five in various tests and exams, for his well-balanced development in all fields, for his broad horizon which is rarely found in other students. As a result, he had been conferred with the title of "Student of Excellence" for three consecutive years, the highest honor in most Chinese high schools. His maste