Construir — "to build" — belongs to a small but extremely productive group of verbs ending in -uir (not -guir or -quir): construir, destruir, incluir, concluir, distribuir, contribuir, sustituir, atribuir, huir, fluir, influir. Every verb in this family follows one tidy rule: insert the letter y between the u of the stem and any ending that does not begin with i. The yo form of the present indicative therefore becomes construyo (not construo); the third-person preterite becomes construyó / construyeron (not construió / construieron); and the gerundio becomes construyendo. Once you spot the pattern, the entire paradigm becomes mechanical.
Non-finite forms
| Form | Spanish | English |
|---|---|---|
| Infinitivo | construir | to build |
| Infinitivo compuesto | haber construido | to have built |
| Gerundio | construyendo | building |
| Gerundio compuesto | habiendo construido | having built |
| Participio | construido (regular) | built |
Note the gerundio: construyendo. The ending -endo doesn't start with i, so the y slips in. The participle construido keeps the i — no y, because the ending already begins with one. This same logic governs every form below.
Indicative — simple tenses
Presente — the y slips in
| yo | tú | él/ella/usted | nosotros | vosotros | ellos/ellas/ustedes |
|---|---|---|---|---|---|
| construyo | construyes | construye | construimos | construís | construyen |
Four forms with y (yo, tú, él, ellos), two without (nosotros, vosotros) — the same "boot" shape you've seen in stem-changing verbs, but driven here by a different rule. Nosotros and vosotros are spared because their endings (-imos, -ís) start with i. Notice the written accent on construís — without it you'd read construis as two syllables, which is wrong.
Construyo muebles a medida en el taller de mi tío los fines de semana.
I build custom furniture at my uncle's workshop on weekends.
Estos pisos los construyen con materiales de mala calidad — se nota a la legua.
They build these flats with low-quality materials — you can tell a mile off.
Pretérito perfecto simple — the y appears in 3rd persons
This is the form -uir verbs are famous for. The endings -ió and -ieron would put a weak i between two vowels, so the i converts to y: construyó, construyeron. The other forms use endings that start with consonants or stressed i, so they stay clean.
| yo | tú | él | nosotros | vosotros | ellos |
|---|---|---|---|---|---|
| construí | construiste | construyó | construimos | construisteis | construyeron |
The yo form construí and the nosotros form construimos are identical to the present-indicative construimos in the latter case — context (ayer, el año pasado) disambiguates.
El ayuntamiento construyó el polideportivo en menos de un año.
The town council built the sports centre in under a year.
Mis abuelos construyeron esta casa con sus propias manos en los años sesenta.
My grandparents built this house with their own hands in the sixties.
Pretérito imperfecto — fully regular
The imperfect endings -ía, -ías, -ía, -íamos, -íais, -ían all start with a stressed í, so no y is needed anywhere.
| yo | tú | él | nosotros | vosotros | ellos |
|---|---|---|---|---|---|
| construía | construías | construía | construíamos | construíais | construían |
Cuando yo era pequeño, todavía construían los edificios con ladrillo macizo.
When I was little, they still built buildings with solid brick.
Futuro simple — fully regular
Future endings attach to the full infinitive construir-, so nothing changes.
| yo | tú | él | nosotros | vosotros | ellos |
|---|---|---|---|---|---|
| construiré | construirás | construirá | construiremos | construiréis | construirán |
Construiremos la valla este fin de semana si no llueve.
We'll build the fence this weekend if it doesn't rain.
Condicional — fully regular
| yo | tú | él | nosotros | vosotros | ellos |
|---|---|---|---|---|---|
| construiría | construirías | construiría | construiríamos | construiríais | construirían |
Yo construiría una terraza más amplia, pero la normativa no lo permite.
I'd build a wider terrace, but the regulations don't allow it.
Indicative — compound tenses
All compound tenses use haber with the regular participle construido.
Pretérito perfecto compuesto
| yo | tú | él | nosotros | vosotros | ellos |
|---|---|---|---|---|---|
| he construido | has construido | ha construido | hemos construido | habéis construido | han construido |
Han construido un parque infantil enfrente del bloque y los niños están encantados.
They've built a playground opposite the block and the kids are thrilled.
Pretérito pluscuamperfecto
| yo | tú | él | nosotros | vosotros | ellos |
|---|---|---|---|---|---|
| había construido | habías construido | había construido | habíamos construido | habíais construido | habían construido |
Cuando llegó la crisis, ya habían construido la mitad de la urbanización.
By the time the crisis hit, they'd already built half of the housing estate.
Futuro compuesto
| yo | tú | él | nosotros | vosotros | ellos |
|---|---|---|---|---|---|
| habré construido | habrás construido | habrá construido | habremos construido | habréis construido | habrán construido |
Para el verano que viene habrán construido el nuevo puente sobre el río.
By next summer they'll have built the new bridge over the river.
Condicional compuesto
| yo | tú | él | nosotros | vosotros | ellos |
|---|---|---|---|---|---|
| habría construido | habrías construido | habría construido | habríamos construido | habríais construido | habrían construido |
Habríamos construido la piscina, pero no nos llegó el dinero.
We would have built the pool, but the money didn't stretch.
Subjunctive — simple tenses
Presente de subjuntivo — y in every form
The present subjunctive endings (-a, -as, -a, -amos, -áis, -an) all start with a, so the y appears throughout. This is one of the few subjunctive paradigms where every single slot shows the spelling change.
| yo | tú | él | nosotros | vosotros | ellos |
|---|---|---|---|---|---|
| construya | construyas | construya | construyamos | construyáis | construyan |
Quiero que construyamos algo duradero, no un parche provisional.
I want us to build something that lasts, not a temporary patch.
Es importante que la empresa construya sobre cimientos sólidos antes de expandirse.
It's important that the company build on solid foundations before expanding.
Imperfecto de subjuntivo (-ra / -se)
The imperfect subjunctive is built from the 3rd-plural preterite stem (construyeron → construye-), so the y propagates through every form.
| yo | tú | él | nosotros | vosotros | ellos | |
|---|---|---|---|---|---|---|
| -ra | construyera | construyeras | construyera | construyéramos | construyerais | construyeran |
| -se | construyese | construyeses | construyese | construyésemos | construyeseis | construyesen |
The -ra set dominates in conversational Spain; -se is reserved for more formal writing. (formal/literary register for -se.)
Si construyeran más vivienda pública, no estaríamos como estamos.
If they built more public housing, we wouldn't be in this mess.
Subjunctive — compound tenses
Pretérito perfecto de subjuntivo
| yo | tú | él | nosotros | vosotros | ellos |
|---|---|---|---|---|---|
| haya construido | hayas construido | haya construido | hayamos construido | hayáis construido | hayan construido |
Me alegra que hayan construido el carril bici por fin.
I'm glad they've finally built the bike lane.
Pluscuamperfecto de subjuntivo
| yo | tú | él | nosotros | vosotros | ellos | |
|---|---|---|---|---|---|---|
| -ra | hubiera construido | hubieras construido | hubiera construido | hubiéramos construido | hubierais construido | hubieran construido |
| -se | hubiese construido | hubieses construido | hubiese construido | hubiésemos construido | hubieseis construido | hubiesen construido |
Si hubieran construido el muro un metro más alto, no habría entrado el agua.
If they'd built the wall a metre higher, the water wouldn't have come in.
Imperative
Affirmative imperatives borrow the relevant subjunctive forms (except tú and vosotros affirmative). The y therefore shows up everywhere except the vosotros affirmative, where the imperative ends in -id.
| Form | Affirmative | Negative |
|---|---|---|
| tú | construye | no construyas |
| usted | construya | no construya |
| nosotros | construyamos | no construyamos |
| vosotros | construid | no construyáis |
| ustedes | construyan | no construyan |
Construye una buena base antes de añadir adornos.
Build a solid base before adding flourishes.
Construid el discurso en torno a una sola idea fuerte.
(You all) build the speech around a single strong idea.
No construyáis castillos en el aire — sed realistas.
Don't build castles in the air — be realistic.
When pronouns attach, write the affirmative imperative + pronoun as one word with the necessary written accent: constrúyelo ("build it"), constrúyemelo ("build it for me"). The accent marks the original stress, which the added syllables would otherwise mask.
Other -uir verbs that work the same way
The list is short but the verbs are extremely common in journalistic and academic Spanish — worth memorizing as a set.
| Verb | Meaning | 1st person present | 3rd singular preterite |
|---|---|---|---|
| destruir | to destroy | destruyo | destruyó |
| incluir | to include | incluyo | incluyó |
| concluir | to conclude | concluyo | concluyó |
| distribuir | to distribute | distribuyo | distribuyó |
| contribuir | to contribute | contribuyo | contribuyó |
| sustituir | to substitute, replace | sustituyo | sustituyó |
| atribuir | to attribute | atribuyo | atribuyó |
| huir | to flee | huyo | huyó |
| influir | to influence | influyo | influyó |
Crucially, seguir, conseguir, perseguir, distinguir are not in this group — they end in -guir, where the u is silent. They follow a completely different paradigm.
High-frequency collocations from peninsular Spanish
| Phrase | Translation |
|---|---|
| construir una casa / un edificio | to build a house / a building |
| construir desde cero | to build from scratch |
| construir una relación / un futuro | to build a relationship / a future (figurative) |
| construir castillos en el aire | to build castles in the air (daydream unrealistically) |
| construir sobre arena | to build on sand (rely on weak foundations) |
| recién construido | newly built |
| en construcción | under construction |
| obra en construcción | building site / works in progress |
Llevan tres años con el chalet en construcción y no se ve el final.
They've had the house under construction for three years and there's no end in sight.
No tiene sentido construir sobre arena — primero hay que arreglar lo de base.
It makes no sense to build on sand — first you have to fix the underlying issue.
The classic English-speaker error
English uses build very loosely — you can build a team, build a business, build muscle, build confidence. Spanish construir is narrower and skews more concrete or formal. For "build a team," peninsular Spanish prefers formar / montar un equipo; for "build muscle," it's desarrollar musculatura or coger / ganar músculo; for "build a business," it's montar un negocio or crear una empresa.
Construir is fully natural for buildings, infrastructure, machines, theories, sentences, identities, and futures — but for everyday "build" in the sense of "put together, assemble, develop," reach for montar, formar, crear, desarrollar first.
✅ Vamos a montar un equipo de ventas.
We're going to build a sales team. (natural in Spain)
❌ Vamos a construir un equipo de ventas.
Grammatical but stilted — sounds like you're physically constructing the team. Native speakers default to *montar / formar* here.
Common Mistakes
❌ Yo construo casas de madera.
Missing the y — the yo form is *construyo*, not *construo*.
✅ Yo construyo casas de madera.
I build wooden houses.
❌ Construieron el edificio el año pasado.
The 3rd-plural preterite needs y, not i — it's *construyeron*, not *construieron*.
✅ Construyeron el edificio el año pasado.
They built the building last year.
❌ Estamos construiendo un puente.
The gerundio is *construyendo*, with y. *Construiendo* doesn't exist.
✅ Estamos construyendo un puente.
We're building a bridge.
❌ Quiero construir un equipo nuevo desde cero.
Grammatically fine but unidiomatic for 'put a team together' — Spain says *montar / formar un equipo*.
✅ Quiero montar un equipo nuevo desde cero.
I want to build a new team from scratch.
Key Takeaways
- Construir is the model -uir verb: insert y between the stem and any ending that doesn't already start with i.
- Present indicative: construyo, construyes, construye, construimos, construís, construyen — y in the boot, plain stem in nosotros / vosotros.
- Preterite: y shows up in the 3rd persons only — construyó, construyeron.
- Gerundio: construyendo (with y); participle: construido (no y).
- The whole present subjunctive shows y: construya, construyas, construya, construyamos, construyáis, construyan.
- Same rule covers destruir, incluir, concluir, distribuir, contribuir, sustituir, atribuir, huir, influir, fluir.
- For abstract "build" (a team, a business, muscle), Spain prefers montar, formar, crear, desarrollar — construir sounds overly literal.
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