Si Clauses (Les Hypothèses): The Three Structures You Must Know

Target: 1,850+ words

"If I study, I will pass." "If I studied, I would pass." "If I had studied, I would have passed."

These three sentences look simple in English. In French, they follow strict tense rules that you cannot break. Getting them wrong is one of the most common errors at B2 level.

Let's master all three hypothesis structures.

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Part 1: The Golden Rule

NEVER put the conditional or future tense after "SI".

• ❌ "Si je viendrai..." (WRONG)
• ❌ "Si je viendrais..." (WRONG)

Part 2: Structure 1 — Real/Possible Condition

SI + Présent → Futur Simple

This describes something likely or possible.

Part 3: Structure 2 — Unreal/Hypothetical Condition (Present)

SI + Imparfait → Conditionnel Présent

This describes something unlikely, imaginary, or contrary to reality now.

Part 4: Structure 3 — Unreal/Hypothetical Condition (Past)

SI + Plus-que-parfait → Conditionnel Passé

This describes something that DIDN'T happen in the past. It's the structure of regret.

Part 5: Summary Table

Part 6: Mixed Hypotheticals

Sometimes the condition is in the past but the result is in the present, or vice versa.

Part 7: Other "If" Expressions

Même si (Even if) — Uses INDICATIVE

• "Même si tu avais raison, je ne changerais pas d'avis."
• NOT subjunctive. The "même" doesn't change the grammar.

Au cas où (In case) — Uses CONDITIONAL

Part 8: Common Exam Traps

1. Using "si" + Conditionnel: "Si j'aurais su" ❌ → "Si j'avais su" ✅

   • This is the number one error. Memorize: SI + NEVER Conditionnel/Futur.
2. Confusing Structures 2 and 3:

Part 9: Practice Transformation

Transform these sentences:

1. "Je suis fatigué. Je ne sors pas." → Si je n'étais pas fatigué, je sortirais.
2. "Tu n'as pas étudié. Tu as échoué." → Si tu avais étudié, tu n'aurais pas échoué.
3. "Il pleut. Nous restons." → S'il ne pleuvait pas, nous ne resterions pas.

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Conclusion

The three Si clause structures are the backbone of hypothetical thinking in French. They test your command of tense systems (Présent, Imparfait, Plus-que-parfait, Futur, Conditionnel Présent, Conditionnel Passé). Master these and you show the examiner that you can express possibility, imagination, and regret with precision. That's C1-level grammar in action.