Formal:
* Falar português: This is the most common and straightforward way to say it.
* Dominar a língua portuguesa: This means "to master the Portuguese language," implying a high level of fluency.
Informal:
* Falar a nossa língua: This literally means "to speak our language," which could be used amongst Portuguese speakers.
* Falamos português: This means "we speak Portuguese," and is a common way to introduce yourself to someone in Portuguese.
Other variations:
* Ter fluência em português: This means "to have fluency in Portuguese," and is a more specific way to describe your Portuguese speaking ability.
* Ser fluente em português: This means "to be fluent in Portuguese."
The best way to choose the right phrase depends on the situation and who you're talking to.