Not every “but” is the same
English “but” hides several different relationships.
Spanish forces you to be more precise:
Quiero ir, pero no puedo.
No es caro, sino económico.
Aunque es caro, vale la pena.
El producto es útil; sin embargo, tiene limitaciones.
Yo prefiero leer; en cambio, mi hermano prefiere escuchar.
These are not interchangeable. They mark contrast, correction, concession, counterargument, or comparison.
The key principle is:
Choose the contrast marker by the logic of the relationship, not by the English word “but.”
Pero: simple contrast or obstacle
pero
Pero is the general contrast connector.
El curso es difícil, pero útil.
The course is difficult but useful.
Quería llamarte, pero no tenía señal.
I wanted to call you, but I had no signal.
It can contrast adjectives, clauses, expectations, or intentions. It is common in speech and writing.
Pero is not inherently informal, but formal prose may use sin embargo or no obstante when the contrast is a larger counterargument.
Sino: correction after negation
sino
Sino corrects a rejected alternative. It normally appears after a negative first part.
No quiero café, sino té.
I don’t want coffee, but tea.
No se trata de memorizar reglas, sino de entender usos.
It is not about memorizing rules, but understanding uses.
If the second part is a full conjugated clause, use sino que:
No dijo que fuera fácil, sino que era posible.
He did not say it was easy, but that it was possible.
Common error:
No quiero café, pero té.
Better:
No quiero café, sino té.
Learner action:
After no X, but Y as correction, think sino, not pero.
Aunque: concession
aunque
Aunque introduces concession: one fact is true or possible, but it does not prevent another.
Aunque llueve, saldremos.
Although it is raining, we will go out.
Aunque sea difícil, vale la pena.
Even if it is difficult, it is worth it.
Mood matters.
With indicative:
Aunque es caro, lo compraré.
Although it is expensive, I will buy it.
The speaker treats the expense as known or real.
With subjunctive:
Aunque sea caro, lo compraré.
Even if it is expensive, I will buy it.
The speaker treats the expense as possible, hypothetical, or irrelevant to the decision.
This contrast is not mechanical, but it is important.
Sin embargo and no obstante: formal counterargument
sin embargo
no obstante
These often connect larger propositions.
El método ofrece buenos resultados en lectura. Sin embargo, no resuelve por sí solo la producción oral.
La muestra es pequeña. No obstante, los resultados permiten formular algunas hipótesis.
Sin embargo is common in formal writing and journalism. No obstante is somewhat more formal or compact. Both often appear after a period or semicolon, followed by a comma.
Learner action:
Use sin embargo/no obstante when the contrast is between sentences or argument moves, not just two adjectives.
En cambio: contrast between alternatives
en cambio
En cambio compares two different cases, preferences, groups, or outcomes.
Ana prefiere estudiar por la mañana. Luis, en cambio, estudia mejor por la noche.
It is close to “whereas,” “by contrast,” or “on the other hand.”
Do not use en cambio when you need correction after negation. That is sino.
Por el contrario: stronger opposition
por el contrario
This marks stronger reversal or contradiction.
No reduce la complejidad del texto; por el contrario, la aumenta.
It is not merely “also different.” It often means the opposite of what was expected or claimed.
Punctuation and placement
Common patterns:
Quería ir, pero no pude.
Comma before pero when connecting clauses.
No es una excepción, sino una regla.
Comma before sino in many written contexts.
Aunque el texto es breve, resulta difícil.
Comma after initial aunque clause.
El texto es breve; sin embargo, resulta difícil.
Semicolon or period before sin embargo works well.
El texto es breve. No obstante, resulta difícil.
Period plus no obstante is common in formal prose.
Argument revision examples
Weak:
La explicación es clara, pero es incompleta, pero ayuda.
Better:
La explicación es clara, aunque incompleta. Aun así, ayuda a identificar el problema principal.
Weak:
No es un error, pero una variante regional.
Better:
No es un error, sino una variante regional.
Weak:
Este método sirve para vocabulario. Pero no sirve para pronunciación.
More formal:
Este método resulta útil para ampliar vocabulario; sin embargo, no basta para mejorar la pronunciación.
Example bank walkthrough
pero
General contrast.
Learner action: use for ordinary “but” when no correction after negation is involved.
sino
Correction after a negative.
Learner action: use no X, sino Y; use sino que before a full clause.
aunque
Concession.
Learner action: watch indicative versus subjunctive: aunque es vs aunque sea.
sin embargo
Formal however.
Learner action: use for sentence-level counterargument.
no obstante
Formal nevertheless/however.
Learner action: useful in reports and academic writing.
en cambio
By contrast.
Learner action: compare two alternatives, groups, or situations.
por el contrario
On the contrary.
Learner action: use for stronger reversal or contradiction.
Contrast decision tree
Ask:
- Are you correcting a negative?
Use sino / sino que.
- Are you simply contrasting two facts?
Use pero.
- Are you saying one fact does not prevent another?
Use aunque.
- Are you contrasting two groups or cases?
Use en cambio.
- Are you making a formal counterargument?
Use sin embargo or no obstante.
- Are you stating the opposite of what was claimed?
Use por el contrario.
- Do you need formal punctuation?
Use semicolon or period before sin embargo/no obstante when appropriate.
Choose the connector after naming the logic
Before choosing pero, sino, aunque, sin embargo, or en cambio, name the relationship between the ideas.
Ask:
Am I adding an obstacle, correcting a wrong alternative, conceding a point, contrasting two options, or reversing an expectation?
This question prevents many errors.
Pero versus sino: the correction test
Sino normally appears after a negated element and corrects it.
No quiero café, sino té.
The structure is:
not A, but rather B.
Pero does not perform the same correction:
No quiero café, pero quiero té.
This is possible, but it sounds like two separate facts: I do not want coffee, but I do want tea. It lacks the tight correction of sino.
With clauses, sino que is used:
No dijo que fuera imposible, sino que era difícil.
The learner rule:
If the first element is negated and the second replaces it, test sino.
Aunque: concession is not simple contrast
Aunque says that one fact does not prevent another fact.
Aunque estaba cansado, terminó el informe.
The tiredness might have prevented finishing, but it did not.
Compare:
Estaba cansado, pero terminó el informe.
This is also possible. Pero marks contrast. Aunque builds concession by making the first clause subordinate.
Mood can change the status of the conceded information:
Aunque es difícil, lo haré.
Even though it is difficult, I will do it.
Aunque sea difícil, lo haré.
Even if it is difficult, I will do it.
The first treats difficulty as real. The second treats it as hypothetical or less asserted. This is one reason contrast and concession belong to advanced grammar, not only vocabulary.
Sin embargo and no obstante need weight
Sin embargo and no obstante are formal counterargument markers. They are often strongest at sentence boundaries:
La propuesta tiene ventajas. Sin embargo, presenta dos problemas importantes.
If used too often, they make prose sound mechanical. If used for trivial contrast, they sound inflated:
Me gusta el café. Sin embargo, hoy tomé té.
This is not impossible, but it is too heavy for an ordinary choice. Pero or en cambio would usually be better.
En cambio versus por el contrario
En cambio compares alternatives:
María prefiere trabajar por la mañana. Juan, en cambio, trabaja mejor por la noche.
Por el contrario is stronger and often rejects or reverses an expectation:
La medida no redujo los costos. Por el contrario, los aumentó.
A common learner mistake is using por el contrario for any mild difference. Save it for sharper opposition.
Revision drills
Weak:
No es caro, pero barato.
Better:
No es caro, sino barato.
Weak:
Aunque la explicación es clara, pero faltan ejemplos.
Better:
Aunque la explicación es clara, faltan ejemplos.
Or:
La explicación es clara, pero faltan ejemplos.
Weak:
Juan estudia francés. Por el contrario, Ana estudia español.
Better:
Juan estudia francés. Ana, en cambio, estudia español.
The repair is not cosmetic. It aligns the connector with the logic.
Connector substitution has limits
Dictionaries may list pero, sin embargo, and no obstante as “but/however.” That does not make them freely interchangeable.
Compare:
Quería salir, pero estaba lloviendo.
Natural, everyday contrast.
Quería salir; sin embargo, estaba lloviendo.
Grammatical, but heavier and more written.
Quería salir; no obstante, estaba lloviendo.
Even more formal; possible in writing, odd in casual speech.
Now consider:
No compré el libro, sino la revista.
Replacing sino with sin embargo breaks the correction:
No compré el libro; sin embargo, la revista.
The connector is not a synonym. It is a logical operator.
Contrast in translation
English “but” often needs different Spanish solutions:
| English sentence | Spanish solution |
|---|---|
| I’m tired, but I’ll go. | Estoy cansado, pero iré. |
| Not coffee, but tea. | No café, sino té. |
| Even though it’s expensive, I’ll buy it. | Aunque es caro, lo compraré. |
| Ana likes it; Juan, on the other hand, doesn’t. | A Ana le gusta; Juan, en cambio, no. |
| It did not help. On the contrary, it made things worse. | No ayudó. Por el contrario, empeoró la situación. |
This table is more useful than a list of “words for but” because it connects connector choice to logic.
Suggested interactive module: contrast connector decision tree
A strong tool for this article would choose connectors by logic.
Suggested functions:
- Input pair: No es caro / es económico.
- Logic label: correction after negation.
- Suggested connector: sino.
- Rewrite: No es caro, sino económico.
- Mood checker: aunque es vs aunque sea.
- Register options: pero, sin embargo, no obstante.
- Punctuation feedback: comma, semicolon, period.
Final rule
Spanish contrast is logical before it is lexical.
Use pero for ordinary contrast, sino for correction, aunque for concession, en cambio for comparison, sin embargo/no obstante for formal counterargument, and por el contrario for strong reversal.
A good connector does not merely join sentences. It names the relationship between them.