1. 您 (nín)  You (used for a second-person pronoun who is older than the speaker or those who are of higher ranks such as your parents, your boss, your manager, your customer, etc.)

2. 您好 (nín hǎo)  hello (to a person who is older or higher in status)

3. 您们 (nínmen) 您 or you in plural

4. 您们好 (nínmen hǎo) hello to 您们。   您们好 (nínmen hǎo)， 欢迎光临 (huānyíng guānglín)。Hello, Sirs or Madams. Welcome to the shop.

https://www.youtube.com/watch?v=VNd31SLwOQ0

https://www.youtube.com/watch?v=Y8AMQKEOycI&t=71s

My email: [email protected]