老师的生日英文怎么说呢

在英语中，我们用词 "birthday" 来表示生日。这个词来自中世纪的英语 "byrþdæg"，其中 "byrþ" 意为 "生"，"dæg" 意为 "日"。

一些例句如下：

My teacher's birthday is on September 15th. (我的老师的生日是9月15日。)
We usually have a small party for our teacher's birthday. (我们通常会为老师的生日举办一个小聚会。)
I gave my teacher a bouquet of flowers for her birthday. (我给老师送了一束花作为生日礼物。)
We sang "Happy Birthday" to our teacher during the assembly. (我们在集会上为老师唱了"生日快乐"。)