materi tentang Greeting and leave taking

Greeting.
When we meet someone we know, we usually greet him/her whatever formal or informal.
The formal greetings are usually used when we meet someone whom we respect.
Informal greeting is used when we meet someone we already know eachother, like classmates, close friend, or friend. 

Leave taking/partings
Leave taking usually used if we part with someone we know. It’s divided into formal and informal parting