Deducir Examples, Sentences and Quiz
Deducir means “to deduce”, and it is one of the verbs you will use every day in Spanish. Deducir means to deduce, and it is used for working something out from clues, evidence or logic, as a detective does. It is a -ducir verb, with the present deduzco and the preterite deduje. This page shows deducir in real sentences, in short dialogues, and in the mistakes learners make most often, and it finishes with a ten-question quiz so you can test yourself. Every sentence below comes with its English translation, and every form is the correct present-tense form unless the sentence is clearly marked as past or future. For a first taste: “Yo deduzco la verdad de las pistas.” — I deduce the truth from the clues.
Deducir in real example sentences
The twelve sentences below are grouped by how deducir is used. Read each one out loud, then read the translation. If a sentence feels useful, copy it into your own notebook with one small change — a different time, a different person, a different place — and you have a new sentence of your own.
In the present: everyday use
These sentences use deducir in the present tense, which is how you will meet it most often: routines, facts, and things happening now.
“Deduzco la verdad de las pistas.” — I deduce the truth from the clues.
“¿Tú deduces el precio del descuento?” — Do you deduce the price from the discount?
“Deduce la respuesta del contexto.” — He/she deduces the answer from the context.
“Deducimos el resultado de los datos.” — We deduce the result from the data.
Talking about the past
The present is not the only tense you need. These sentences show deducir in the past, so you can talk about what already happened.
“Ayer, yo deduje la verdad de las pistas.” — Yesterday, I deduced the truth from the clues. (preterite)
“Él deducía el precio del descuento todos los días.” — He used to deduce the price from the discount every day. (imperfect)
Plans and things already done
These sentences look forward, or look back at something already finished. Notice how the verb form changes while the meaning of deducir stays the same.
“Nosotros deduciremos la respuesta del contexto mañana.” — We will deduce the answer from the context tomorrow. (future)
“¿Tú has deducido el resultado de los datos?” — Have you deduced the result from the data? (present perfect)
More everyday uses
Four more present-tense sentences, covering the remaining persons, so you can see the whole table in action.
“Deducís la verdad de las pistas.” — You deduce the truth from the clues.
“Deducen el precio del descuento.” — They deduce the price from the discount.
“Deduzco la respuesta del contexto.” — I deduce the answer from the context.
“Deduce el resultado de los datos.” — He/she deduces the result from the data.
Deducir in context
Single sentences teach you the forms. Dialogues teach you when to use them. Read the short conversation below, then the paragraph that follows, and notice how deducir appears naturally, without anyone stopping to think about conjugation.
A short dialogue
Lucía: “¿Tú deduces la verdad de las pistas?” — Do you deduce the truth from the clues?
Carlos: “Sí, yo deduzco la verdad de las pistas.” — Yes, I deduce the truth from the clues.
Lucía: “Nosotros deducimos el precio del descuento.” — We deduce the price from the discount.
Carlos: “Y ellos deducen la respuesta del contexto.” — And they deduce the answer from the context.
Lucía: “Vosotros deducís el resultado de los datos.” — You deduce the result from the data.
Carlos: “Sí, y él deduce el precio del descuento.” — Yes, and he deduces the price from the discount.
A short paragraph
Lucía deduce la verdad de las pistas, y Carlos deduce el precio del descuento. Nosotros deducimos la respuesta del contexto, y ellos deducen el resultado de los datos. Yo deduzco la respuesta del contexto, y mi padre deduce el resultado de los datos. Deducir is part of everyday life, because to deduce is something Spanish speakers do again and again, in every tense and every situation.
Common mistakes with deducir
These are the errors learners actually make with deducir. Each one shows the wrong version, the right version, and why the correction matters.
Wrong: “Yo deduce la verdad de las pistas.” Right: “Yo deduzco la verdad de las pistas.” Why: The person matters: deduce is the él/ella/Ud. form, while the yo form is deduzco. Using the third-person form with yo is one of the most common beginner errors.
Wrong: “Ayer yo deducí el precio del descuento.” Right: “Ayer yo deduje el precio del descuento.” Why: Deducir has an irregular preterite: the correct first-person form is deduje, not the regular deducí. Learn the preterite forms in the table as a set.
Wrong: “Treating deducir and inferir as identical in every context.” Right: “Deducir means to deduce, while inferir means to infer.” Why: They overlap, but each has uses the other does not: deducir fits sentences such as Deduzco la verdad de las pistas, while inferir belongs in a different sentence. Check the meaning you want before choosing.
Wrong: “Yo soy deducido el precio del descuento.” Right: “Yo he deducido el precio del descuento.” Why: Spanish perfect tenses use haber, not ser: he deducido, has deducido, ha deducido. Ser plus the participle makes a passive, not a perfect tense.
Wrong: “De niño, yo deduje la respuesta del contexto todos los días.” Right: “De niño, yo deducía la respuesta del contexto todos los días.” Why: For a repeated habit in the past, use the imperfect (deducía), not the preterite. The preterite (deduje) is for one finished action.
Quiz: deducir in use
Ten questions on deducir in real sentences. Choose the correct answer for each one, then check the answer key. Every answer is explained.
1. Complete the sentence: “Vosotros ______ la verdad de las pistas.” (The truth from the clues.)
- (a) deducís
- (b) deduzco
- (c) deduces
Answer: deducís — The vosotros/as form of deducir in the present is deducís.
2. Complete the sentence: “Ellos ______ el precio del descuento.” (The price from the discount.)
- (a) deduzco
- (b) deduces
- (c) deducen
Answer: deducen — The ellos/ellas/Uds. form of deducir in the present is deducen.
3. Complete the sentence: “Yo ______ la verdad de las pistas.” (The truth from the clues.)
- (a) dedujo
- (b) deduje
- (c) dedujiste
Answer: deduje — The yo form of deducir in the preterite is deduje.
4. Complete the sentence: “Él ______ el precio del descuento.” (The price from the discount.)
- (a) deducía
- (b) deducías
- (c) deducíamos
Answer: deducía — The él/ella/Ud. form of deducir in the imperfect is deducía.
5. Complete the sentence: “Nosotros ______ la respuesta del contexto.” (The answer from the context.)
- (a) deduciré
- (b) deducirás
- (c) deduciremos
Answer: deduciremos — The nosotros/as form of deducir in the future is deduciremos.
6. What does deducir mean in English?
- (a) to introduce, to insert
- (b) to deduce
- (c) to infer
Answer: to deduce — Deducir means “to deduce”. The other options are the meanings of different verbs.
7. Which sentence is correct?
- (a) Yo deduzco la verdad de las pistas.
- (b) Ellos deduce la verdad de las pistas.
- (c) Yo deduzco el precio del descuento ayer.
Answer: Yo deduzco la verdad de las pistas. — “Yo deduzco la verdad de las pistas.” is correct. The other two sentences contain the mistakes explained in the section above.
8. How do you say “I deduce the truth from the clues.” in Spanish?
- (a) Yo deducen la verdad de las pistas.
- (b) Yo deduje la verdad de las pistas.
- (c) Yo deduzco la verdad de las pistas.
Answer: Yo deduzco la verdad de las pistas. — “Yo deduzco la verdad de las pistas.” is the correct translation. The second option uses the wrong person's form, and the third uses the preterite.
9. What is the nosotros form of deducir in the present tense?
- (a) deduces
- (b) deducimos
- (c) deduzco
Answer: deducimos — The nosotros form is deducimos.
10. Which of these sentences is in the present tense?
- (a) Ayer, yo deduje la verdad de las pistas.
- (b) Nosotros deduciremos la verdad de las pistas mañana.
- (c) Yo deduzco la verdad de las pistas.
Answer: Yo deduzco la verdad de las pistas. — “Yo deduzco la verdad de las pistas.” is in the present tense. The other two are in the preterite and the future.
Frequently asked questions
How do you say 'I deduce' in Spanish?
Say 'Yo deduzco la verdad de las pistas'. The complement follows directly, as in the examples above. For a routine, add a time expression: 'Yo deduzco la verdad de las pistas todos los días'.
How do you say 'I deduce' in the past?
For one finished action, say 'Ayer, yo deduje el precio del descuento'. For a repeated habit, say 'Yo deducía el precio del descuento todos los días'. For something already done, say 'Yo he deducido el precio del descuento'.
What is the difference between deducir and inferir?
Deducir means to deduce, while inferir means to infer. They are easy to confuse because they appear in similar situations, but they are not interchangeable: use deducir when you mean to deduce, as in Deduzco la verdad de las pistas.
Related pages
- Full conjugation of deducir — every tense of deducir in one place.
- Deducir in the preterite tense — the full table and usage rules for one tense.
- Spanish verbs — the hub for every Spanish verb on VerbFlow.
- Verb quiz — test yourself on deducir and other verbs.
- Conjugation practice — drill the forms of deducir until they are automatic.