Formal:
* Bom dia (Good morning) - Used from sunrise to noon.
* Boa tarde (Good afternoon) - Used from noon to sunset.
* Boa noite (Good evening/night) - Used from sunset onwards and also as a farewell.
* Cumprimentos (Greetings) - A more formal greeting, often used in written communication.
* Saudações (Greetings) - Similar to "cumprimentos", a more formal greeting.
Informal:
* Olá (Hello) - The most common and versatile greeting, suitable for most situations.
* Oi (Hi) - A more casual and informal greeting, similar to "hey".
* E aí? (What's up?) - A very informal way to greet someone, similar to "how are you?".
Other ways:
* Tudo bem? (How are you?) - A common question used after a greeting.
* Bem, obrigado/a (Fine, thank you) - A common response to "Tudo bem?".
* Tudo bem, e você? (Fine, and you?) - A polite response to "Tudo bem?".
Key points:
* Formal vs. informal: Use formal greetings with people you don't know well, in professional settings, or with elders. Use informal greetings with friends, family, and people you know well.
* Time of day: Be mindful of the time of day when choosing your greeting.
* Context: Pay attention to the situation and choose a greeting that is appropriate.
Remember: Practice these greetings and don't be afraid to use them! People will appreciate your effort to speak their language.