最喜欢的老师用英文怎么说

"favorite teacher" 是表示 "最喜欢的老师" 的常用表达方式。

例句：

Mrs. Smith is my favorite teacher.
(史密斯夫人是我最喜欢的老师。)
He always talks about his favorite teacher from high school.
(他总是谈论他高中时期最喜欢的老师。)

来源："favorite" 在这里是形容词，意思是 "最喜爱的"。"teacher" 是名词，意思是 "老师"。