23 Different ways to greet someone in English

General greetings -Formal

These greetings can be used in any formal situation, such as a business meeting or meeting someone’s parents, and they can also be used in informal situations as well

• Hello
• How are you? or How’re you
• How are you doing? or How ya doin’
• ?How is everything
• ?How’s everything going

General greetings - Informal

• ?(Hey) What’s up (man/dude/bro/their name)
• ?Hey) Good to see you)
• ?(Hey) How are things (with you)
• ?Hey) How’s it going)

-Greeting a person you haven’t seen for a long time Formal

• It has been a long time
• It’s been too long
• ?What have you been up to all these years
• .It’s always a pleasure to see you
• ?How long has it been
• ?What’s new

- Greeting a person you haven’t seen for a long time Informal

• Long time no see

• ?Where have you been hiding

• It’s been ages since I’ve seen you
• ?How’ve you been

Source: http://reallifeglobal.com/23-different-ways-greet-someone-english/