If sino, si no, and pero slow you down while writing Spanish, stop translating every one as "but." Ask whether the sentence is correcting a negative idea, adding a condition, or simply contrasting two facts.
The direct answer: use sino after a negative statement when you mean "not this, but rather that." Use sino que when the replacement is a full clause with a conjugated verb. Use si no as two words when it means "if not." Use pero for a normal contrast that does not replace a negated idea.
The decision table
| What you mean | Use | Example | Fast check |
|---|---|---|---|
| Correct a negative noun, adjective, or phrase | sino | No quiero café, sino té. | "Not coffee, but tea instead." |
| Correct a negative clause with a conjugated verb | sino que | No trabajo hoy, sino que estudio. | A new subject-verb idea follows. |
| State a condition | si no | Si no puedes hoy, hablamos mañana. | You can hear "if not." |
| Contrast two true or possible ideas | pero | Quiero ir, pero estoy cansado. | No correction is happening. |
| Add a second idea after "not only" | no solo... sino también | No solo habla español, sino también sueco. | The second part adds, not replaces. |
Why this mistake survives past beginner level
English hides several jobs inside "but." Spanish separates them. Pero opposes ideas: Es caro, pero útil. Sino rectifies a previous negation: No es caro, sino barato. Si no is conditional si plus negative no.
RAE's current DPD entry makes the learner-facing rule sharper: when sino introduces a replacement clause with a finite verb, modern standard Spanish uses sino que. That is why No fui al cine, sino que me quedé en casa works.
The three mistakes that show up while typing
1. Using pero when you are correcting
If the first part says "not X" and the second part replaces X, choose sino, not pero.
- No vivo en Madrid, sino en Valencia.
- No necesito más vocabulario, sino más práctica.
2. Forgetting que before a new verb
After sino, ask whether a whole new conjugated verb is coming. If yes, add que.
- No compro el curso, sino que uso los materiales que ya tengo.
- No lo dije para criticarte, sino que quería ayudarte.
3. Writing sino when you mean "if not"
If you can expand the sentence into an if-clause, write two words: si no.
- Si no entiendes la frase, escríbela otra vez.
- Ven a las seis; si no, empezamos sin ti.
The 12-minute correction loop
Use messages you might actually type: plans, preferences, work updates, corrections, and gentle disagreements.
- Write eight English prompts. Make three "not X but Y" corrections, two "if not" conditions, two normal contrasts, and one "not only... but also" sentence.
- Label the sentence job. Mark each line as replace, condition, contrast, or add before translating.
- Choose the Spanish connector. Pick sino, sino que, si no, pero, or no solo... sino también.
- Type from memory. Hide the table and rebuild the eight sentences without looking.
- Repeat only misses tomorrow. Keep the sentence job but change the nouns and verbs so the choice transfers to new writing.
Pair it with these LingoAI loops
If Spanish choices collapse when you translate from English, pair this with the stop-translating-in-your-head loop. For another high-pressure writing distinction, review the por vs para decision loop.
FAQ
What is the difference between sino and pero?
Use sino when the second part corrects or replaces something negated in the first part. Use pero when the second part simply contrasts with the first part.
When do I use sino que?
Use sino que when the replacement after sino is a clause with a conjugated verb: No descanso, sino que trabajo.
Is si no the same as sino?
No. Si no means "if not" and is written as two words. Sino is one word when it corrects a negated idea or appears as the noun meaning fate or destiny.
Does sino always need a comma?
In the common correction pattern, sino normally follows a comma: No quiero café, sino té. Some other uses, such as meanings close to "except" or "nothing but," can work without the same comma pattern.
Bottom line
Do not memorize sino as just another "but." Before you type, label the sentence job: replacement, replacement plus verb, condition, or contrast.
Evidence notes
- Current learner pain signal: an April 2026 r/SpanishLearning thread asked how to use sino, with follow-up confusion around sino que, si no, and pero: How to use "sino" in Spanish?
- RAE/ASALE's DPD explains sino as an adversative conjunction that can replace an element negated earlier, and says sino que is used when the contrasted element is a finite clause: DPD: sino.
- The same DPD entry distinguishes sino from si no, the sequence formed by conditional si plus the negation no: DPD: sino vs si no.
- RAE's grammar glossary describes adversative conjunctions such as pero and sino as connectors that oppose ideas, with sino used in examples that correct a negated element: RAE GTG: conjunción adversativa.
- Retrieval-practice rationale: a 2025 open-access review reports that overt retrieval, such as typing an answer, can help when material has multiple connected parts instead of one simple association: Rivers, Northern, and Tauber (2025).