Wonderful time usually goes by swiftly.You give us too much knowledge that we don't know before,thank you for teaching us how to be an useful person! 美妙的时光通常会很快过去。你给了我们太多我们以前不知道的知识，谢谢你教我们如何成为一个有用的人！you have been a qualified teachers and even better friend. thank you for all that you have done. 你是一个合格的老师，甚至更好的朋友。谢谢你所做的一切。we all like having you as our teacher. you have our respect and gratefulness. 我们都喜欢让你当我们的老师。你有我们的尊重和感激。