French Si Clauses: Real, Hypothetical, and Unreal Past

“If it rains, we’ll stay home.” “If I had more money, I’d travel the world.” “If I’d studied, I would’ve passed.”

All three sentences describe a condition and what would happen, or would have happened, if that condition were met. But the verb forms change depending on whether the situation is possible, hypothetical, or an imagined alternative to something that happened in the past.

French does the same thing with si clauses (phrases hypothétiques). And the good news? There are three main patterns to learn.

✦The Question✦

How real is this “if”?

Real or possible: something that could genuinely happen.
Hypothetical: something you’re imagining rather than presenting as reality.
Unreal past: something that didn’t happen, but you’re imagining a different outcome.

Each type uses a particular combination of verb tenses:

How Real?	The Si Part	The Result
Real or possible	Presentsi tu viens…	Present, future, or commandon ira au cinéma
Hypothetical	Imparfaitsi j’avais de l’argent…	Present conditionalje voyagerais
Unreal past	Plus-que-parfaitsi j’avais étudié…	Past conditionalj’aurais réussi

Think of each sentence as two parts: the condition (the si part) and the result (what happens if that condition is met).

1. Real Conditions

Start with something that could actually happen.

Si j’ai le temps, je t’aiderai. If I have time, I’ll help you. si + present → future

Maybe I’ll have time, maybe I won’t. But it’s a genuine possibility, so French uses the present after si. The result can be in the present, future, or a command, depending on what you’re expressing:

Si tu chauffes l’eau, elle bout. If you heat water, it boils. present → present: general result

Si tu étudies, tu réussiras. If you study, you’ll succeed. present → future: possible result

Si tu as faim, mange quelque chose. If you’re hungry, eat something. present → command: instruction

No Future After Si

Here’s something that may surprise English speakers: even when you’re talking about the future, French uses the present after si. The future belongs in the result, not the si clause.

Si tu viendras demain, nous irons au cinéma. If you come tomorrow, we’ll go to the movies. ❌ incorrect — future after si

Si tu viens demain, nous irons au cinéma. If you come tomorrow, we’ll go to the movies. ✅ correct — present after si

Real Conditions in the Past

Real conditions can also describe things that actually happened repeatedly in the past. Then both halves use the imparfait:

Quand Léa était petite, s’il neigeait, elle restait à la maison. When Léa was little, whenever it snowed, she stayed home. imparfait → imparfait: past habit

This isn’t a hypothetical. It describes a real pattern from the past. A useful test: if you can naturally replace “if” with “whenever,” you’re describing a past habit.

✋ Checkpoint

You’ve learned how si works with real or possible conditions, including situations that happened repeatedly in the past. Try the Si Real Conditions deck before moving on to hypotheticals.

2. Hypothetical Conditions

Now imagine something that isn’t true, or that you’re treating as unlikely. Maybe you don’t have enough money to travel. Maybe you’re imagining what you’d do if you were someone else. French uses the imparfait after si and the present conditional in the result.

Si j’avais plus d’argent, je voyagerais davantage. If I had more money, I would travel more. avais → voyagerais

Si j’étais riche, j’achèterais une maison au bord de la mer. If I were rich, I’d buy a house by the sea. étais → achèterais

Si je pouvais voler, je n’aurais pas besoin de voiture. If I could fly, I wouldn’t need a car. pouvais → aurais

Notice that the imparfait doesn’t mean the condition happened in the past. Here, it imagines a different present or future.

No Conditional After Si

English sometimes uses “would” in hypothetical statements, but French doesn’t put the conditional directly after si. The si half uses the imparfait; only the result uses the conditional.

Si j’aurais de l’argent, je voyagerais. If I had money, I would travel. ❌ incorrect — conditional after si

Si j’avais de l’argent, je voyagerais. If I had money, I would travel. ✅ correct — imparfait after si

Comme Si: As If

Comme si (as if) introduces an imagined comparison. Like hypothetical si clauses, it uses the imparfait for a situation that isn’t real.

Il parle comme s’il savait tout. He talks as if he knew everything. comme si + imparfait

Elle me regarde comme si j’étais fou. She looks at me as if I were crazy. comme si + imparfait

Habit or Hypothetical?

The imparfait appears after si in both real past habits and hypotheticals. The result tells you which one you’re dealing with:

Si j’avais du temps, je lisais. Whenever I had time, I read. real past habit — imparfait + imparfait

Si j’avais du temps, je lirais. If I had time, I would read. hypothetical — imparfait + conditional

The si half is identical. The first describes something that really happened repeatedly; the second imagines what would happen if things were different.

✋ Checkpoint

You’ve learned how to build hypothetical situations using the imparfait and conditional, and why the conditional doesn’t belong directly after si. The Si Hypotheticals deck will help you practice these combinations before tackling the past.

3. Unreal Past Conditions

The final pattern imagines how the past might have turned out differently. Maybe you didn’t study and failed an exam. Maybe you missed a train. The events are over, but French lets you imagine an alternative: the plus-que-parfait after si and the past conditional in the result.

Si j’avais étudié, j’aurais réussi l’examen. If I had studied, I would have passed the exam. avais étudié → aurais réussi

Si tu étais parti plus tôt, tu aurais attrapé le train. If you’d left earlier, you would have caught the train. étais parti → aurais attrapé

Si nous avions réservé une table, nous aurions pu dîner au restaurant. If we’d reserved a table, we could have eaten at the restaurant. avions réservé → aurions pu

The implication is that it didn’t happen: I didn’t study, and I didn’t pass. The logic is the same as in Section 2, but everything has shifted into the past.

No Past Conditional After Si

Just as the present conditional doesn’t belong after si, neither does the past conditional. The condition uses the plus-que-parfait; the result uses the past conditional.

Si j’aurais étudié, j’aurais réussi. If I had studied, I would have passed. ❌ incorrect — past conditional after si

Si j’avais étudié, j’aurais réussi. If I had studied, I would have passed. ✅ correct — plus-que-parfait after si

4. A Few Things Worth Remembering

The Order Can Change

The si clause doesn’t have to come first. The tenses stay the same either way.

Si tu viens, je serai content. If you come, I’ll be happy. si clause first

Je serai content si tu viens. I’ll be happy if you come. result first — same tenses

Si Becomes S’ Before Il

Si shortens to s’ before il and ils, but not before elle or other vowels.

S’il pleut demain, on restera à la maison. If it rains tomorrow, we’ll stay home. si + il → s’il

Si elle vient, on ira au cinéma. If she comes, we’ll go to the movies. si elle — no elision

Not Every Si Means a Condition

French also uses si to mean “whether” in indirect questions. That si isn’t a condition, so the future (or conditional) is perfectly correct:

Je ne sais pas s’il viendra. I don’t know whether he’ll come. si = whether — future is fine

🏁 Final checkpoint

You’ve now learned the three main si patterns: real conditions, hypothetical situations, and imagined alternatives to the past.

The Si Past Regrets deck will help you practice the plus-que-parfait and past conditional together. If you haven’t already, practice the Si Real Conditions and Si Hypotheticals decks too.