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Once you have been itroduced to someone, the next time you see that person it is important to greet them. We also greet people as we leave people.In english( as in all languages), there are different ways to greet people in formal and informal situations.
Formal Greetings: Arriving
Good morning/ afternoon/ evenings
Hello (name), How are you?
Good day Sir / Madam (very formal)
Informal Greeting: Arriving
Hi/ hello
how are you?
What´s up? (very informal)
How are you doing? ( very informal)
It´s important to know that the questions "How are you?" or "What´s up?" doesn´t necessary need a response. If you do respond, these phrases are generally expected:
Very well, Thank you. And you ( formal)
Fine/ great (informal)
Formal greetings: Departing
Good morning/ afternoon/ evening
It was a pleasure seeing you.
goodbye.
Note: after 8 pm- good night