Usages of avisar
Quando venceres o concurso, avisa-me.
When you win the contest, let me know.
Eu aviso os amigos antes de jantar.
I inform my friends before dinner.
Quem quer que chegue atrasado ao turno deve avisar o chefe de equipa.
Whoever arrives late for the shift must inform the team leader.
Elon.io is an online learning platform
We have an entire course teaching Portuguese grammar and vocabulary.