Formal:
* Bom dia: This is the most common and formal greeting. It literally translates to "good day."
* Bom dia a todos: This means "good morning to everyone."
Informal:
* Olá: This is a very common greeting, similar to "hello" in English.
* Oi: This is a more casual version of "Olá" and is commonly used among friends and family.
* Bom dia! Tudo bem? This means "Good morning! Everything okay?" and is a friendly greeting.
You can also add a name to the greeting:
* Bom dia, Maria: This means "Good morning, Maria."
Important note: In Portuguese, we don't use "good morning" after noon. After midday, you would use "Boa tarde" (good afternoon).