Formal:
* Bem-vindo: This is the most common and formal way to say "welcome." It literally translates to "well-come." You can use this for both singular and plural.
* Bem-vinda: This is the feminine form of "bem-vindo," used for a single female.
* Bem-vindos: This is the plural form of "bem-vindo," used for multiple people.
* Bem-vindas: This is the plural form of "bem-vinda," used for multiple females.
Informal:
* Seja bem-vindo(a): This is a slightly less formal way to say "welcome," literally meaning "be well-come." It's a good option for everyday situations.
* Sejam bem-vindos(as): This is the plural form of "seja bem-vindo(a)," used for multiple people.
Other options:
* Boas-vindas: This literally translates to "good-comings" and can be used as a greeting or to say "welcome."
* Bem-estar: This means "well-being" and can be used to express a welcome and wish someone a pleasant stay.
The best way to choose which phrase to use depends on the situation and the person you're talking to.