Learn Spanish (Latin America): Cuando nos casemos, vamos a comprar una casa. - When we get married, we are going to buy a house.

Because this event hasn't happened yet! When cuando introduces an action that is still in the future, Spanish requires the subjunctive mood. That's why we use casemos to mean "When we get married (in the future)."

What would it mean if I accidentally said Cuando nos casamos?

Using the normal present tense after cuando changes the meaning to "whenever" or describes a repeating routine. So, Cuando nos casamos, vamos a comprar una casa sounds like "Whenever we get married, we buy a house," which implies getting married is a repeating habit!

Why do we need the word nos before the verb?

In Spanish, the verb for "to get married" is casarse. Because it ends in -se, it's a reflexive verb, meaning it needs a pronoun to match the person doing the action. Since "we" are getting married, we use the pronoun nos.

Could I use the future tense compraremos instead of vamos a comprar?

Yes, absolutely! Vamos a comprar (we are going to buy) and compraremos (we will buy) are both completely correct here. Latin American speakers often prefer using ir a + an infinitive verb (like vamos a comprar) for everyday future plans because it sounds very natural.