French Si-Clauses: The 3 Types of 'If' Sentences

Say Si j'aurai le temps, je viendrai to a French speaker and you'll get a small wince, even though every individual word is correct. The verb tenses in French's si-clauses ("if" clauses) aren't optional flavor -- they're the only signal telling your listener whether you mean a real possibility, a daydream, or a regret about something that already happened.

English gets away with reusing roughly the same "if... then" shape for a possible plan, a wild hypothetical, and a past that never happened -- context does most of the work. French refuses to blur those cases: it locks each meaning to one specific pairing of tenses, and mixing them up is the single most common si-clause mistake English speakers make. Learn the three patterns below and you'll stop guessing at which tense goes where.

One French Word, Three Fixed Tense Pairings

French uses a single word, si (if), to open every one of these sentences -- but each situation locks onto its own tense pairing, and that pairing is what actually carries the meaning, not the word si itself.

Grammar Note

• Type 1 -- a real, open possibility: si + present, with the result in the present, the futur simple, or the imperative.
• Type 2 -- a present-tense hypothetical: si + imparfait, with the result in the conditionnel présent.
• Type 3 -- a past-tense regret: si + plus-que-parfait, with the result in the conditionnel passé.
• Common mistake: reaching for the futur simple or a conditionnel form right after si itself -- in all three patterns, the clause that starts with si never takes either of those two tenses.

Type 1: Si + Présent -- A Real, Open Possibility

Use this pattern for something that could genuinely happen -- a real condition, not a fantasy. It covers daily plans, weather-dependent decisions, and straightforward instructions.

• Si tu as faim, il y a du pain dans la cuisine. (If you're hungry, there's bread in the kitchen.) -- present result.
• Si tu viens demain, je serai content. (If you come tomorrow, I will be happy.) -- futur simple result.
• Si tu as froid, ferme la fenêtre. (If you're cold, close the window.) -- imperative result.

Grammar Note

• Common mistake: putting the futur simple right after si itself -- si tu viendras is wrong. The si-clause always stays in the present; only the result clause is allowed to move into the future.
• The present tense after si here has nothing to do with right now specifically -- it can point at tomorrow, next year, or a general truth.

Type 2: Si + Imparfait -- A Present (or Future) Daydream

Use this pattern for something unlikely, imaginary, or simply contrary to how things currently stand -- what you'd do in a different life, or a hypothetical version of right now.

• Si j'avais plus de temps, je voyagerais plus souvent. (If I had more time, I would travel more often.)
• Si tu étais moi, qu'est-ce que tu ferais ? (If you were me, what would you do?)
• Si nous habitions à Paris, on irait au musée chaque week-end. (If we lived in Paris, we'd go to the museum every weekend.)

Key Phrases

• si j'avais (see zhah-vay) — if I had
• je voyagerais (zhuh vwa-yah-zhuh-ray) — I would travel
• si tu étais (see tew ay-tay) — if you were
• qu'est-ce que tu ferais (kess kuh tew fuh-ray) — what would you do

[AUDIO: si j'avais] [AUDIO: je voyagerais]

Grammar Note

• The imparfait here doesn't mean "used to" -- inside a si-clause, it signals "not really true right now," not a repeated past habit.
• Common mistake: adding extra words to sound more hypothetical -- the imparfait by itself already carries that meaning; French doesn't need a marker on top of it.

Type 3: Si + Plus-Que-Parfait -- A Regret About the Past

Use this pattern for something that didn't happen and can't be changed now -- classic regret-and-hindsight territory.

• Si j'avais su, je ne serais pas venu. (If I had known, I wouldn't have come.)
• Si tu m'avais appelé, j'aurais répondu. (If you had called me, I would have answered.)
• Si elle était partie plus tôt, elle n'aurait pas raté le train. (If she had left earlier, she wouldn't have missed the train.)

French speakers reach for this exact pattern constantly in everyday small talk about missed chances -- si j'avais su ("if I had known") is common enough to function almost like its own interjection, the French equivalent of a resigned "well, hindsight...".

Grammar Note

• Both halves of this sentence look back at the past: the si-clause uses the plus-que-parfait (imparfait of avoir/être plus a past participle), and the result uses the conditionnel passé (conditionnel présent of avoir/être plus a past participle) -- the same auxiliary machinery, just shifted from imparfait to conditionnel présent.
• Common mistake: using the conditionnel présent instead of the conditionnel passé in the result clause -- si j'avais su, je ne viendrais pas describes a different situation (not showing up now or later), not "I wouldn't have come."

Telling the Difference in a Real Conversation

Picture two friends, Léa and Sam, planning a trip -- and drifting through all three patterns without even noticing.

• Sam: Si tu es libre samedi, on pourrait visiter le Louvre. (If you're free Saturday, we could visit the Louvre.) -- Type 1.
• Léa: J'aimerais bien, mais si j'avais plus d'argent, je préférerais un vrai voyage à Paris plutôt qu'une simple visite. (I'd love to, but if I had more money, I'd rather take a real trip to Paris than just a visit.) -- Type 2.
• Sam: Tu sais, si on avait réservé les billets en janvier, on aurait économisé beaucoup. (You know, if we had booked the tickets in January, we would have saved a lot.) -- Type 3.
• Léa: Bon, la prochaine fois. Si tu veux, on regarde les prix ce soir. (Okay, next time. If you want, we'll look at prices tonight.) -- Type 1 again.

Notice how the tense pairing switches every time the meaning switches -- a real Saturday plan, an imagined bigger budget, and a past booking that never happened, each locked to its own fixed pair of tenses.

Practice Exercises

• Fill in the blank (Type 1): Si tu ___ (avoir) le temps, appelle-moi.
• Fill in the blank (Type 2): Si j'___ (être) riche, j'achèterais une maison à la campagne.
• Translate into French using Type 3: "If she had studied, she would have passed the exam." (use étudier, réussir)
• Multiple choice: which tense belongs in the result clause of a Type 2 sentence? (a) futur simple (b) conditionnel présent (c) conditionnel passé
• True or false: the verb right after si can be conditionnel or futur simple.
• Rewrite as Type 2 (imparfait plus conditionnel présent): Si j'ai de l'argent, je voyage.

Answer Key

• as -- Si tu as le temps, appelle-moi. (Type 1: si + present)
• étais -- Si j'étais riche, j'achèterais une maison à la campagne. (Type 2: si + imparfait)
• Si elle avait étudié, elle aurait réussi l'examen. (Type 3: si + plus-que-parfait, result in conditionnel passé)
• (b) conditionnel présent
• False -- the si-clause itself only ever takes the present, the imparfait, or the plus-que-parfait; the conditionnel and futur simple only ever appear in the result clause.
• Si j'avais de l'argent, je voyagerais.

Three Patterns, Locked Together

• Type 1 (real possibility): si + present, result in the present, futur simple, or imperative.
• Type 2 (present hypothetical): si + imparfait, result in the conditionnel présent.
• Type 3 (past regret): si + plus-que-parfait, result in the conditionnel passé.

Next time you reach for "if" in French, pause and ask which of these three situations you're actually describing -- the tense pairing follows automatically once you know the answer. Head over to Passage's lessons on the imparfait, the conditionnel, and the plus-que-parfait to shore up each piece individually, then try the si-clauses exercises to put all three patterns to the test together.