Formal:
* 王先生 (Wáng Xiānshēng): This is the most common and formal way to address Mr. Wang. It literally means "Mr. Wang."
Informal:
* 王老师 (Wáng Lǎoshī): This is used to address Mr. Wang if he is a teacher. It means "Teacher Wang."
* 老王 (Lǎo Wáng): This is a more casual way to address Mr. Wang, often used by people who know him well. It means "Old Wang."
Note: The use of "Mr." is not directly translated into Chinese. Instead, the family name is followed by a title like "先生" (xiānshēng) for men, "女士" (nǚshì) for women, or "老师" (lǎoshī) for teachers.