Once you have been introduced 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.
Arriving Good morning / afternoon / evening. Hello (name), how are you? Good day Sir / Madam (very formal) Formal Greetings:
Informal Greetings: Arriving Hi / Hello How are you? What's up? (very informal) How are you doing? (very informal)
It's important to note that the question "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 p.m. - Good night.
Informal Greetings: Departing Goodbye / Bye. See you (later). Later (very informal
¡Hola! Hi (Hello)! ¿Cómo estás? How are you? (3) ¿Cómo te va? How are you doing? ¿Cómo andas? How are you getting on? ¿Cómo andan los Murphy? How are the Murphys (4) getting on? Estoy bien, gracias I am well (fine), thank you Perfectamente, gracias Quite well, thank you
(2) Good night se usa como fórmula de despedida. Si se quiere decir buenas noches , se dice good evening : Buenas noches, amigos míos. Good evening, my friends (aunque sean las 23:00 hs.).
(3) How do you do (Encantado, Mucho gusto) se utiliza para presentaciones formales y al responder se repite la fórmula, mientras que How are you? (¿Cómo estás?) se emplea para situaciones informales y se responde con Fine, Very well, Great, Not so well, etc. ( Bien, Muy bien, Fantástico, No tan bien , etc.)