What is the preterite of saber in Spanish?

Supe, supiste, supo, supimos, supisteis, supieron. Irregular u-stem. Usually translates as found out (came to know), not neutral knew.

What's the difference between supe and sabía?

Supe (preterite) = found out / came to know at a specific moment. Sabía (imperfect) = had known / was aware (ongoing past knowledge). Supe la verdad ayer (I found out yesterday) vs. Sabía la verdad desde hace años (I had known for years).

Why does the preterite of saber mean found out instead of knew?

Spanish preterite implies bounded / completed actions. With a verb of state like saber (knowledge), bounding it puts focus on the moment knowledge ENTERED, i.e., when you found out. Sabía (ongoing) corresponds to knew.

Is supe ever just I knew?

Rarely. Most contexts where you'd say I knew in English correspond to sabía in Spanish. Supe almost always implies the moment of discovery.

How can I master the preterite of saber?

Memorize the u-stem (sup-) with shared irregular endings. Practice the meaning shift through real examples, cuando lo supe... is a great pattern. Native input through Parrot reinforces when supe means found out.

Spanish grammar · Intermediate

Preterite of Saber: Conjugation and How to Use It

Written by Sofia Ramirez, Lead Spanish Curriculum Editor · Reviewed May 2026

The preterite of saber is irregular u-stem: supe, supiste, supo, supimos, supisteis, supieron. Meaning shift: supe usually means I FOUND OUT (came to know), not just I knew. Sabía (imperfect) is the neutral I knew.

Supe la verdad anoche.

I found out the truth last night.

What it is

The preterite of saber is irregular with a u-stem: supe, supiste, supo, supimos, supisteis, supieron. Meaning shift: supe usually translates as I FOUND OUT (came to know), the moment knowledge was acquired. Sabía (imperfect) is the neutral I knew / had knowledge of.

Supe la verdad anoche (I found out the truth last night), the moment of discovery. Compare to Sabía la verdad (I knew the truth, ongoing knowledge).

How to spot it

Look for sup- + endings (-e, -iste, -o, -imos, -isteis, -ieron). No accents.

Lo supe ayer. — I found out yesterday.
Supiste lo que pasó. — You found out what happened.
Supieron la noticia. — They learned the news.

Same u-stem family as estar (estuve), tener (tuve), poder (pude), poner (puse). Different stems, same endings.

Preterite of Saber Quick Reference

Preterite of saber, irregular u-stem

Person	Form	Translation
yo	supe	I found out / knew
tú	supiste	you found out
él/ella/Ud.	supo	he/she/it found out
nosotros	supimos	we found out
vosotros	supisteis	you all found out (Spain)
ellos/ellas/Uds.	supieron	they found out

Common Preterite of Saber Examples in Spanish

Preterite of saber in real contexts:

Found Out (Moment of Discovery)

Supe la verdad anoche.: I found out the truth last night.
Supimos del accidente esta mañana.: We learned about the accident this morning.
Cuando lo supe, no podía creerlo.: When I found out, I couldn't believe it.

Standard for the moment knowledge was first acquired. Often paired with cuando lo supe.

Received News

Supiste lo de María, ¿verdad?: You heard about María, right?
Supieron del incendio en las noticias.: They learned about the fire on the news.

Used for hearing or learning about events, often through someone else or media.

Supe Que + Clause

Supe que viniste.: I found out you came.
Supieron que ganamos.: They learned that we won.

Supe + que + indicative reports the moment of learning a fact.

Contrast with Sabía

Lo supe ayer. (found out): I found out yesterday.
Lo sabía desde hace tiempo. (knew): I had known it for a while.

Supe = moment of discovery. Sabía = ongoing knowledge state.

How to Use the Preterite of Saber

Memorize the U-Stem Forms

Saber uses sup- + irregular endings (-e, -iste, -o, -imos, -isteis, -ieron). No accents.

Supe, supiste, supo, supimos, supisteis, supieron.

I found out, you found out, he found out, we found out, you all found out, they found out.

Same endings as other u-stem verbs (pude, tuve, estuve, puse).

Meaning Shift: Supe = Found Out

Preterite of saber refers to the MOMENT knowledge was acquired, found out, learned, came to know.

Supe la noticia anoche. = I found out the news last night.

I found out the news last night.

If you mean had knowledge in general, use sabía. If you mean came to know at a specific point, use supe.

Pair with Cuando Lo Supe

Common construction: cuando lo supe + reaction. Marks the moment of learning and what happened next.

Cuando lo supe, lloré. Cuando lo supieron, se alegraron.

When I found out, I cried. When they found out, they were happy.

Use this pattern to describe how someone reacted to learning something.

Supe Que vs. Sabía Que

Supe que = found out that. Sabía que = knew that (ongoing). Both take indicative in the dependent clause.

Supe que viniste. (found out you came) Sabía que vendrías. (knew you would come)

I found out you came. I knew you would come.

Choose preterite or imperfect of saber based on whether you're describing the moment of learning or pre-existing knowledge.

Common Mistakes with Preterite of Saber

Incorrect: Yo sabí la verdad anoche. — I found out the truth last night.

Correct: Yo supe la verdad anoche. — I found out the truth last night.

Saber is irregular in preterite, use sup- stem. Don't apply regular -er endings (sabí).

Incorrect: Supe la verdad desde hace años. — I have known the truth for years.

Correct: Sabía la verdad desde hace años. — I have known the truth for years.

For ongoing past knowledge (desde hace años), use imperfect (sabía). Supe is for the specific moment of discovery.

Incorrect: Translating supe as I knew without context. — I knew vs. I found out.

Correct: Translating supe as I found out. — I found out.

English I knew typically maps to sabía. The preterite supe almost always carries the discovery meaning, found out, learned.

Meaning Shift: Supe vs. Sabía

Supe = Moment of Discovery

Preterite of saber marks the specific moment knowledge was acquired. Translates as found out, learned, came to know.

Supe la verdad cuando lo vi.: I found out the truth when I saw him.
Supieron del problema en la reunión.: They learned about the problem at the meeting.

Use for bounded events of learning, not for continuous past knowledge.

Sabía = Ongoing Knowledge

Imperfect of saber describes knowledge as a state, ongoing, with no clear start point.

Sabía la verdad. (had known): I knew the truth.
Sabíamos lo que pasaba.: We knew what was happening.

Default for past knowledge with no focus on the moment of learning.

Preterite of Saber FAQs

What is the preterite of saber in Spanish?: Supe, supiste, supo, supimos, supisteis, supieron. Irregular u-stem. Usually translates as found out (came to know), not neutral knew.
What's the difference between supe and sabía?: Supe (preterite) = found out / came to know at a specific moment. Sabía (imperfect) = had known / was aware (ongoing past knowledge). Supe la verdad ayer (I found out yesterday) vs. Sabía la verdad desde hace años (I had known for years).
Why does the preterite of saber mean found out instead of knew?: Spanish preterite implies bounded / completed actions. With a verb of state like saber (knowledge), bounding it puts focus on the moment knowledge ENTERED, i.e., when you found out. Sabía (ongoing) corresponds to knew.
Is supe ever just I knew?: Rarely. Most contexts where you'd say I knew in English correspond to sabía in Spanish. Supe almost always implies the moment of discovery.
How can I master the preterite of saber?: Memorize the u-stem (sup-) with shared irregular endings. Practice the meaning shift through real examples, cuando lo supe... is a great pattern. Native input through Parrot reinforces when supe means found out.