Questions & Answers about A semana tem sete dias.
In Portuguese, it is very common to use the definite article (o, a, os, as) when talking about something in a general sense.
So:
- A semana tem sete dias. = The week has seven days.
In natural English, we usually say A week has seven days without the, but Portuguese often prefers the article here.
If you say just semana by itself, the sentence sounds incomplete.