先生

先生 is a Noun, which means “teacher; husband; Mr.”

1) 先生 is the address for a person with a higher level of knowledge. In ancient times, "teacher" was called 先生; In today's society, university professors can also be addressed as 先生.

2) In modern society, 先生 is also a polite expression in social situations. Women are generally referred to as 女士 or 小姐; addressing a man as 先生.

姓 (Family name) + 先生/女士/小姐

张   先生

李   先生 

王   女士

赵   小姐

3) 先生 can also refer to a woman as herself or her husband, usually preceded by the personal pronoun "你/ 我/ 她", as in:

你先生（丈夫）做什么工作？

我先生（丈夫）在大学工作。

那是她先生（丈夫）。