Usages of quatro
A psicóloga ensinou-me a respirar profundamente, contando até quatro e deixando o ar sair devagar.
The psychologist taught me to breathe deeply, counting to four and letting the air out slowly.
Eu tenho quatro amigos no trabalho.
I have four friends at work.
Elon.io is an online learning platform
We have an entire course teaching Portuguese grammar and vocabulary.