Greeting

Teacher   : good morning guys. How are you?
Students : good morning . Very well sir , how about you?
Teacher : I’m fine..Let’s start the lesson !
……………………………………………………..
teacher : ok guys, time is over, see you next  Friday..
students : thanks for the lesson, see you !

Hey do you know something about this dialogue ?
Yup, it’s example of greeting. We use it every time in our  life, don’t we?
when you meet someone, exactly you need greeting in opening conversation. Greeting also used when you introduce yourself and other people (friend) and when you end a conversation (leave talking). 
  

This is several examples when you greet other people :
--How are you ?
--How's life ?
--Good morning / good afternoon / good evening
--Hello / hiThis is several examples when you introduce yourself:
--Let me introduce my self, my name is Udin
--Hello, I'm Sono
--Hi, I'm Sulaiman. You can call me Serman. 
This is several examples when you introduce to other people :
--I would like to introduce Alam
--I would like you to meet Serto
-- Excuse me, let me introduce you a new friend. His name is  Deswe
--Mendez this is Saipol, my Teacher

This is several examples when you end a conversation (leave talking):
--Well, I should be going now
--See you !
--I'm sorry, but I have to go now
--It's been nice talking with you, see you later !
--good night, have a nice dream .