他成为老师了吗英文怎么说

是的，如果他成为了老师，可以用英文表示为："He became a teacher."

关于这个表达的来源：

"Became"是英语动词，意思是"变成"、"成为"。它是"be"的过去式和过去分词，例如：

He is a teacher. 他是老师。
He was a teacher. 他是老师。
He will be a teacher. 他将成为老师。

"A teacher"是一个定语从句，修饰"he"，表示"他成为了老师"。

下面是一些其他例句，希望能帮到你：

He became a doctor after finishing medical school. 他在医学院毕业后成为了医生。
She became an engineer after completing her degree. 她在完成学位后成为了工程师。
He became a famous artist after his work was exhibited in a major gallery. 他的作品在一家大型画廊展出后成为了著名艺术家。