先生用英文怎么表达？?

　　A teacher's a teacher; a student's a student.

　　先生就是先生，学生就是学生。

　　Our English teacher, will leave for America tomorrow.

　　我们的英语老师怀特先生明天将去美国。

　　Love is a great teacher.

　　爱情是伟大的先生。

　　I'm working as a teacher.

　　我是一个教书先生。

　　The teacher had both extensive knowledge and profound scholarship.

　　先生的学问博大精深。