1、you have been a qualified teachers and even better friend. thank you for all that you have done. 您不仅是一位合格的教师，更是一位好朋友，谢谢您所做的一切。
2、you are not only a good teacher but our close friend. thank you for helping us make something of our lives. 您不仅是一位好老师，也是我们亲密的朋友，谢谢您帮助我们奋发有为。
3、you are like a third parent. we all love you and respect you. 您就象我们的家长，我们都敬爱您。
有人说，老师如蜡烛一般，燃尽自己，照亮他人；有人说，老师如园丁一般，培育着祖国的花朵。然而，我却认为，“老师”这个词的伟大，是无法比喻的。因为老师的爱，包容天地！敬爱的老师，您为了学生，平时备课是多么辛苦。但您毫无怨言，仍然将最精彩的一课带给了您的学生！老师，请您接受我最崇高的敬意！
有点肉麻，不过适用于各科老师哦！可以修改一下！
My high school headteacher teaches my English. He is handsome. And he is very thin for hardwork. He is about forty years old. He looks serious. But in fact, he is kind, nice and warmhearted