Learn Spanish (Latin America): Quedamos en decidir cómo celebrar el aniversario. - We agreed to decide how to celebrate the anniversary.

Quedar is a very flexible verb! When you use the structure quedar en followed by an infinitive (like decidir), it specifically means "to agree on" or "to commit to" doing something. It's a very common, everyday way to talk about making a plan with someone.

Is quedamos in the present or past tense in this sentence?

It is in the past tense (preterite) here, meaning "we agreed." For -ar verbs like quedar, the nosotros (we) form is identical in both the present and the past tense. You have to rely on context to know which one it is, and when recalling a plan you made, the past tense is the most natural fit.

Why does decidir stay in its unconjugated infinitive form?

In Spanish, any verb that immediately follows a preposition (like en, a, de, con, or por) must be in the infinitive form. Since it comes right after en, it has to be decidir.

Why is it just cómo celebrar instead of a conjugated verb like cómo celebramos?