Learn Portuguese (Portugal): O que vais fazer na próxima semana?

Just like in English, you can talk about the future using the verb to go (ir) plus another action word in its basic, unchanged form. Here, vais means you are going and fazer means to do. Together, vais fazer means you are going to do.

Why does the question start with O que instead of just Que?

When the word what stands alone as the main question word, Portuguese almost always uses O que. If you just used Que, it would usually need to be followed immediately by a noun, like Que livro which means What book.

Why is there a na before próxima semana?

In Portuguese, you do not just say next week on its own. You have to say in the next week. The word na is a mandatory contraction combining em (in) and the feminine word for the, which is a.

How do I know who this question is asking if there is no word for you?

The verb vais is strictly for tu, the informal singular word for you. In Portuguese, the verb ending usually gives away who is doing the action, so the pronoun tu is often left out to sound more natural.