Good morning, good afternoon, good evening.

Basically, a formal greeting is a clear, properly-constructed sentence and uses the full words. "Hi" is short for "hello", so that's informal. Avoid shortening words, and avoid slang of course. Informal: Hi, I'm Amir. How're you? Formal: Hello, my name is Amir. How do you do? Some examples of formal greetings: How do you do? (This is just a polite greeting; reply with the same sentence) How are you doing? (Also polite, but this is a question.) Good morning / Good day / Good evening. It's a pleasure to meet you. (first meeting) It's a pleasure to see you again. (if you already know them)

Hello . My name is Amir . How are you sir/madam ? how is everything ? how are you doing ? you can say : hope everything is good good morning صبح بخير good afternoon بعد ظهر بخير good evening عصر بخير good night شب بخير nice to meet you or it is a pleasure to meet you if you have a meeting and you want him/her to sit down you can say : have a seat please if you are inviting someone to do something : would you like to ....( for example : go to the cinema ...etc) if you wanna leave him/her you can say : good bye thanks for your time have a nice time pleased to meet you hope that we can meet again

Pleased to meet you.

Yo, dude!