Acabar De + Infinitive: 6 Rules for Saying You Just Did Something in Spanish

English has a neat little trick for talking about the very recent past: you just add “just.” I just ate. She just left. We’d just arrived. Spanish doesn’t have a word that works that way next to a verb — there’s no direct translation for “just” sitting beside an action. Instead, Spanish reaches for a specific construction: acabar de + infinitive.

It’s one of the most useful patterns you’ll learn, because it comes up constantly in real conversation — explaining why you’re late, what you just ate, what someone just told you. Here are the six rules that cover everything you need to use it correctly.

1. The basic formula: acabar de + infinitive

Conjugate acabar in the right tense and person, add de, then finish with the infinitive of the action verb. That’s the whole structure:

• Acabo de comer. — I have just eaten / I just ate.
• Acaba de llegar. — She has just arrived / She just arrived.
• Acabamos de ver la película. — We just watched the movie.

Notice that Spanish uses the present tense of acabar even though the action is finished — the “pastness” is carried by the word acabar itself, not by a past-tense ending.

2. Conjugate acabar for the person doing the action

Acabar is a regular -ar verb, so it conjugates exactly the way you’d expect. Only acabar changes with the subject — the second verb always stays in the infinitive, no matter who’s doing it.

• (Yo) acabo de llamar. — I just called.
• (Tú) acabas de llegar. — You just arrived.
• (Él/Ella) acaba de salir. — He/She just left.
• (Nosotros) acabamos de empezar. — We just started.
• (Ellos) acaban de irse. — They just left.

3. Never put a past participle after “de”

This is the single most common mistake English speakers make with this construction, because English does the opposite: “I have just left” uses a past participle. Spanish never does.

• ❌ Acabo de llegado.
• ✅ Acabo de llegar. — I just arrived.

Whatever comes after de stays in its unconjugated, infinitive form (ending in -ar, -er, or -ir) — exactly like after any other preposition in Spanish.

4. Use the imperfect for “had just” in the past

To talk about something that had just happened before another past event, switch acabar into the imperfect: acababa de + infinitive.

• Acababa de salir cuando empezó a llover. — I had just left when it started to rain.
• Acababan de sentarse cuando sonó el teléfono. — They had just sat down when the phone rang.

It’s the same logic as the present-tense version — just shifted one step further into the past.

5. “No acabar de” can mean “not quite”

This is the twist most textbooks skip. In the negative, no acabar de + infinitive often doesn’t mean “haven’t just done something” — it means you can’t quite manage to do something, or you don’t fully understand it.

• No acabo de entenderlo. — I don’t quite get it / I can’t quite understand it.
• No acaba de convencerme. — It doesn’t quite convince me.

Context usually makes the meaning obvious, but it’s worth knowing this second use exists so it doesn’t trip you up the first time you hear it.

6. Don’t confuse it with acabar por

Acabar por + infinitive looks similar but means something completely different: “to end up doing” or “to finally do” something, usually after some resistance or delay.

• Acabé por aceptar el trabajo. — I ended up accepting the job.
• Acabó por confesar. — He finally confessed.

Acabar de is about timing — something just happened. Acabar por is about outcome — something eventually happened. Keep the preposition straight and you’ll keep the meaning straight.

Make it automatic

The fastest way to make acabar de feel natural is to use it constantly for small, true things: what you just had for breakfast, what you just finished reading, where you just got back from. It’s a construction built for small talk, which makes it perfect to practise out loud.

Try narrating your last hour in Spanish using nothing but acabo de sentences, then take it into a real conversation. If you want feedback on whether you’re using it naturally, book a lesson with a native Spanish teacher, or take Parlazo’s free Spanish level test to see where this kind of everyday grammar currently stands.