A correlative conjunction is a pair of linkers that work together to coordinate two parallel elements: both X and Y, either X or Y, neither X nor Y. Spanish has a rich inventory of these — some of them everyday (ni X ni Y, o X o Y), some of them register-marked for careful writing (tanto X como Y, no solo X sino también Y), and some genuinely literary (ya X ya Y, bien X bien Y). Mastering them is one of the clearest C1 markers: a learner who writes no solo es inteligente sino también amable sounds three rungs higher than one who writes es inteligente y amable.
This page covers all the productive correlatives in peninsular Spanish, their agreement rules, the register each one carries, and the discourse moves they unlock.
Tanto X como Y — "both X and Y"
The workhorse formal correlative for additive coordination. It says "X and Y, in equal measure" and is far more emphatic than bare y.
Tanto los profesores como los alumnos están preocupados por los recortes.
Both the teachers and the students are worried about the cuts.
Esta medida afectará tanto a las familias como a las empresas.
This measure will affect both families and businesses.
Tanto si vienes como si no, te avisaremos del resultado.
Whether you come or not, we'll let you know the result.
Habla tanto inglés como francés con fluidez.
She speaks both English and French fluently.
Agreement of tanto
When tanto directly modifies a noun, it agrees with it in gender and number: tanto, tanta, tantos, tantas.
Tantos hombres como mujeres asistieron a la conferencia.
As many men as women attended the conference.
Tantas niñas como niños jugaban en el patio.
Both girls and boys played in the courtyard.
But when tanto is followed by a definite article (tanto los X como los Y), it stays invariable. The grammatical work is being done by the article rather than by tanto directly.
Tanto las profesoras como los alumnos estaban contentos.
Both the (female) teachers and the (male) students were happy.
The two patterns:
- Tantos X como Y — tanto agrees, no article ("as many X as Y").
- Tanto los X como los Y — tanto invariable, with article ("both the X and the Y").
In formal writing the article-headed version is more common; the bare tantos X como Y is slightly more numerical/quantitative.
Ni X ni Y — "neither X nor Y"
The correlative negative. The single-ni pattern (no X ni Y) is more colloquial; the correlative ni X ni Y is more emphatic and works better in writing.
Ni el calor ni la lluvia nos pararon: llegamos a la cima.
Neither the heat nor the rain stopped us — we made it to the top.
Ni quiere ni puede ayudarnos en esto.
He neither wants to nor can help us on this.
No tengo ni tiempo ni ganas de discutirlo ahora.
I have neither the time nor the desire to argue about it now.
Ni Marta ni Luis llegaron a tiempo a la reunión.
Neither Marta nor Luis arrived on time at the meeting.
When ni X ni Y opens the sentence (as in the first and last examples), the second ni still goes right before the second element. The structure is fully parallel: ni + element + ni + element.
Verb agreement with ni X ni Y
When ni X ni Y serves as a coordinated subject and appears before the verb, the verb is plural in peninsular Spanish:
Ni Marta ni Luis han llegado todavía.
Neither Marta nor Luis have arrived yet.
When the ni X ni Y phrase comes after the verb, the verb can be singular or plural:
No ha llegado ni Marta ni Luis.
Neither Marta nor Luis has arrived.
Either form is acceptable; the plural is more common in careful writing.
O X o Y — "either X or Y"
The exclusive-or correlative. More emphatic than bare o — it insists that exactly one of the two will happen.
O vienes ahora o me voy yo solo.
Either you come now or I'm going by myself.
O dices la verdad o te callas, no hay término medio.
Either tell the truth or be quiet — there's no middle ground.
O nos ponemos de acuerdo hoy o cancelamos el proyecto.
Either we agree today or we cancel the project.
O bien lo haces tú, o bien lo hago yo.
Either you do it, or I do it.
The variant o bien X o bien Y adds bien for slightly more emphasis and slightly more formal register. Both forms are alive in peninsular Spanish.
No solo X sino también Y — "not only X but also Y"
The formal additive-emphatic correlative. This is the construction that elevates an ordinary list to something rhetorically structured, and it appears constantly in essays, opinion pieces, and persuasive speech.
No solo es inteligente, sino también amable.
She's not only intelligent but also kind.
No solo nos ayudó con la mudanza, sino que también pagó el camión.
He didn't just help us with the move — he also paid for the truck.
La crisis no solo afecta al sector industrial, sino también al sector servicios.
The crisis affects not just the industrial sector but also the services sector.
No solo te lo dije una vez, sino que te lo repetí tres veces.
I didn't just say it once — I repeated it three times.
Sino también vs sino que también
The shape of the second half depends on whether it contains a full clause:
- Phrase: no solo X sino también Y (no solo inteligente sino también amable).
- Clause (with conjugated verb): no solo X sino que también Y (no solo lo dijo sino que lo hizo).
This is the same rule as plain sino / sino que on the coordination page, now applied inside the no solo… sino… correlative.
Word-order variants
The first half can also be inverted, with the no solo clause appearing in a fronted position for stylistic effect:
Inteligente no solo es, sino también muy creativa.
Not only is she intelligent, but also very creative. (stylistic inversion)
This is reserved for high-register writing; in ordinary speech, stick to the canonical order.
Ya X ya Y — "now X, now Y" (literary)
A literary correlative meaning sometimes X, sometimes Y or now X, now Y. It evokes alternation, often emotional or atmospheric. You will find it in literary prose, poetry, and essayistic writing — almost never in conversation.
Ya ríe, ya llora: nunca se sabe cómo va a reaccionar. (literary)
Now she laughs, now she cries — you never know how she's going to react. (literary)
El paisaje cambia constantemente: ya verde, ya amarillo, ya rojo. (literary)
The landscape changes constantly: now green, now yellow, now red. (literary)
Ya hablan de mudarse, ya cambian de opinión. (literary)
One moment they're talking about moving, the next they change their mind. (literary)
If you use ya X ya Y in casual conversation, it will sound strange. Reserve it for written register, and even there, use it sparingly — it is a marked stylistic choice.
Bien X bien Y — "either X or Y" (formal)
A formal alternative to o X o Y, used in instructions, contracts, and careful prose. Often appears with o bien introducing the first element.
Puede contactarnos bien por correo, bien por teléfono. (formal)
You can contact us either by post or by telephone. (formal)
El pago se realizará bien en efectivo, bien por transferencia bancaria. (formal)
Payment shall be made either in cash or by bank transfer. (formal)
O bien aceptamos las condiciones, o bien renunciamos al proyecto. (formal)
Either we accept the conditions, or we renounce the project. (formal)
In a business letter or a legal document, bien X bien Y sounds correct and dignified. In a casual conversation it would be jarring — a Spaniard would say o por correo o por teléfono.
Que X que Y — "whether X or Y" (colloquial)
A colloquial correlative meaning "whether X or Y, it doesn't matter." Common in spoken Spanish, especially with weather, plans, and similar contingencies.
Que llueva, que no llueva, mañana salimos de excursión.
Whether it rains or not, we're going on the outing tomorrow.
Que te guste, que no te guste, hay que hacerlo.
Whether you like it or not, it has to be done.
Que venga, que no venga, la cena se hace igual.
Whether he comes or not, dinner happens anyway.
The pattern uses the subjunctive in both halves (because the alternatives are hypothetical) and conveys an attitude of "I don't care which — the outcome is the same." It is colloquial peninsular Spanish and very natural in informal speech.
Apenas X cuando Y — "no sooner X than Y"
A temporal correlative for narrating closely-sequenced events. Common in narrative writing and storytelling.
Apenas había llegado a casa cuando empezó a llover a cántaros.
No sooner had I got home than it started bucketing down.
Apenas se sentó cuando sonó el teléfono.
He'd barely sat down when the phone rang.
Apenas cerré los ojos cuando sentí que alguien me tocaba el hombro.
No sooner had I closed my eyes than I felt someone tap my shoulder.
The construction often pairs the pluperfect (había llegado) in the first half with the preterite (empezó) in the second, mirroring the English no sooner had I X-ed than Y happened structure. In peninsular Spanish this is a natural narrative move.
Unos X otros Y — "some X, others Y"
A distributive correlative used to describe how members of a group divide along two behaviours or properties.
Unos cantaban, otros bailaban: era una fiesta de las buenas.
Some were singing, others were dancing — it was a proper party.
Unos a favor, otros en contra: la votación fue muy reñida.
Some in favour, others against — the vote was very close.
Unos llegaron temprano, otros llegaron con retraso.
Some arrived early, others arrived late.
The variants unos… los otros…, unos cuantos… los demás…, and parte… parte… all do similar distributive work with slightly different feels. Unos X otros Y is the most common.
Cuanto más X, más Y — "the more X, the more Y"
A correlative of proportion. The first half sets a variable; the second half reports how another variable scales with it.
Cuanto más leo, más cuenta me doy de lo poco que sé.
The more I read, the more I realise how little I know.
Cuanto menos hables en esta reunión, mejor.
The less you say in this meeting, the better.
Cuanto antes lleguemos, antes podremos descansar.
The sooner we arrive, the sooner we can rest.
The structure is cuanto + comparative, then the matching más / menos / antes / mejor / peor in the second half. Don't confuse this with cuánto (with accent), which is interrogative — ¿cuánto cuesta?.
When to reach for a correlative
A practical question: when does a careful peninsular speaker choose the correlative over the bare conjunction? Two heuristics:
- Emphasis and parallelism. When you want to insist that both X and Y are equally true (tanto X como Y), or that both are equally negated (ni X ni Y), the correlative front-loads the emphasis.
- Register. Formal writing — opinion pieces, essays, business correspondence — leans on correlatives to signal rhetorical structure. The same content with bare y and o reads as casual or rushed.
A practical comparison:
| Bare conjunction (informal) | Correlative (formal) |
|---|---|
| Los profesores y los alumnos están preocupados. | Tanto los profesores como los alumnos están preocupados. |
| Es inteligente y amable. | No solo es inteligente, sino también amable. |
| No vino Marta ni Luis. | Ni Marta ni Luis vinieron. |
| O lo haces o no lo haces. | O bien lo haces, o bien lo dejas. |
In a casual conversation, the left column is what you'd hear. In a polished argumentative essay, the right column is what you'd write.
English contrast
English correlatives map fairly cleanly onto Spanish ones, with one structural mismatch worth flagging: not only X but also Y in English allows considerable flexibility about where the comma falls and whether but or yet appears. Spanish no solo X sino también Y is more rigid — the sino is obligatory after the negation, and the second half must be parallel.
| English | Spanish |
|---|---|
| Both X and Y | Tanto X como Y |
| Either X or Y | O X o Y / O bien X o bien Y |
| Neither X nor Y | Ni X ni Y |
| Not only X but also Y | No solo X sino también Y |
| Whether X or Y | Tanto si X como si Y / Que X que Y |
| The more X, the more Y | Cuanto más X, más Y |
| Now X, now Y | Ya X ya Y (literary) |
The one to watch closely: whether X or Y has two Spanish equivalents with different registers. Tanto si vienes como si no is the formal/neutral form (and uses si + indicative for both halves); que vengas que no vengas is the colloquial form (subjunctive in both halves).
Common Mistakes
❌ Es inteligente sino también amable.
Wrong — 'sino' is the second half of a correlative; the first half ('no solo') is required. Without it, the sentence collapses.
✅ No solo es inteligente, sino también amable.
She's not only intelligent but also kind.
❌ No solo lo dijo, sino también lo hizo.
Wrong — when the second half is a full clause with its own verb, you need 'sino que', not 'sino'.
✅ No solo lo dijo, sino que también lo hizo.
He didn't just say it — he also did it.
❌ Tantos los profesores como los alumnos están preocupados.
Wrong — when followed by an article, 'tanto' stays invariable.
✅ Tanto los profesores como los alumnos están preocupados.
Both the teachers and the students are worried.
❌ Cuanto más leo, mucho más sé.
Wrong — 'cuanto más X' pairs with bare 'más Y' in the second half, not 'mucho más'.
✅ Cuanto más leo, más sé.
The more I read, the more I know.
❌ Ya ríe, ya llora, vamos a llegar tarde si no para de cambiar de humor.
Wrong register — 'ya X ya Y' is literary; in casual conversation use 'a veces ríe, a veces llora' or 'tan pronto ríe como llora'.
✅ Tan pronto ríe como llora; vamos a llegar tarde si no se decide.
One moment she's laughing, the next crying — we'll be late if she doesn't make up her mind.
Key takeaways
- Tanto X como Y = formal "both X and Y." Tanto agrees with the noun when no article follows; stays invariable when an article does.
- Ni X ni Y = correlative "neither nor." Verb is plural when the subject precedes the verb in peninsular standard.
- O X o Y / O bien X o bien Y = exclusive "either or."
- No solo X sino también Y = the workhorse formal additive. Use sino que también when the second half is a full clause.
- Ya X ya Y and bien X bien Y are literary / formal; reserve them for written register.
- Que X que Y
- subjunctive is colloquial and very peninsular ("whether X or Y").
- Cuanto más X, más Y is the proportional correlative; both halves take the comparative form.
- Correlatives are a high-leverage register-raising tool. Swap y for tanto X como Y, or pero for no solo X sino también Y, and your Spanish reads as carefully constructed.
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