Dear teacher:
I will soon study in the meddle school. Thanks for you teaching me for so many years. I will bear in mind you to teach me.I think of very much in the time of the primary school. I will stduy hard. I will recompense you. As you has often remarked, one is never too old to learn.I will often come back to see you.
loves,
(你的名字)
老师：
我马上要进入初中学习了。感谢您多年来对我的指导。我会谨记您对我的教诲。我很怀念在小学的时光。我会努力学习,将来报答您。正如您常说的那样，人要活到老学到老。我会常回来看您的!
您的学生
(你的名字)