Greeting : There are many words for greeting.
" Hello." For every people.
" Hi " For closing people.
" Good morning " are polite words using in the morning.
" Good afternoon " are poilte words using in the afternoon.
" Good evening " are polite words using in the evening and all night.
" How do you do " are very polite words using in every time.
Aparting : There are many words for aparting too.
" Good bye , Bye , See you later , So long , Good night , See you "