Dear Mr./Ms. XXX
Happy teachers' day. Thank you for teaching me patiently last semester/this semester. I really learn some knowledge from you. Thank you so much and wish that you can keep healthy and everything goes well with your work.
Best regard,
XXX
不知道你什么水平,我就随便一写,不过要是大学一下还是可以用的,如果大学英语专业或是给外教,这个看起来就有点简单了, 不过心意最重要嘛~~~
追问还有吗 我想参考一下其他 你能不能提供多一点?