"My dearest teacher" 可以用英语表达为 "my beloved teacher" 或 "my most beloved teacher"。

"Dearest" 是形容词，意思是 "最亲爱的"。

"Beloved" 是形容词，意思是 "亲爱的"。

"Most" 是形容词，意思是 "最"。

下面是一些例句:

My dearest teacher, thank you for everything you have done for me.
My most beloved teacher, you have changed my pfe in so many ways.
I will always be grateful to my beloved teacher for the guidance and support you provided me.

例句翻译:

我最亲爱的老师, 谢谢你为我做的一切。
我最亲爱的老师, 你已经改变了我的生活。
我将永远感激我亲爱的老师给予我的指导和支持。