Learn Portuguese (Portugal): Nós compramos um carro novo em junho.

We use the preposition em. When you want to say something happens in a specific month, you just use em directly followed by the name of the month, exactly like em junho.

Why is the word order carro novo instead of novo carro?

In Portuguese, descriptive words (adjectives) like novo (new) almost always come right after the noun they describe. So, 'a new car' becomes um carro novo.

Can I leave out the word Nós at the beginning?

Yes, you can! Because the verb compramos already has the 'we' ending built into it, the word Nós (we) is optional. You will often hear native speakers just say Compramos um carro novo em junho.

How do we know compramos is present tense ('buy') and not past tense ('bought')?