Usages of nas
Nas montanhas, o tempo muda rápido e geralmente faz frio à noite.
In the mountains, the weather changes quickly and it is usually cold at night.
Eu gosto de descansar nas férias.
I like to rest on vacation.
O doutor disse que eu preciso descansar porque estou com dor nas costas.
The doctor said that I need to rest because I have back pain.
Se eu ficar com dor nas costas, vou descansar em casa.
If I get back pain, I will rest at home.
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