Conditional Sentences with *Si* in French

In Brief

For a real or possible condition, use si + present, followed by a present, future, or imperative form: Si tu viens, je serai content. For an imagined or unlikely present situation, use si + imparfait, followed by the present conditional: Si j'avais le temps, je viendrais. In a conditional clause, standard French does not use the conditional directly after si.

Overview

French conditional sentences connect a condition with its result. The condition is introduced by si (“if”), while the other clause says what happens, will happen, or would happen if that condition is met. A clause is simply a part of a sentence built around a verb. In Si tu viens, je serai content, si tu viens is the condition and je serai content is the result.

At B1, the key choice is between two patterns. Si + present presents the condition as real, open, or genuinely possible. Si + imparfait presents it as imagined, contrary to the current facts, or less likely. The imparfait is the French imperfect tense; here it does not necessarily refer to past time. Instead, it creates distance from reality. The present conditional is the “would” form, such as je viendrais (“I would come”).

This differs from English in one especially useful way: French and English both avoid “will” in many ordinary if-clauses, but French tense matching is more systematic. English “If I had time” looks like a past form even though it refers to now; French works similarly with si j'avais le temps. Learning the patterns as pairs is safer than translating each verb separately.

How It Works

The two core patterns

Meaning	Condition clause	Result clause	Example
Fact, habit, or general result	si + present	present	Si on chauffe l'eau, elle bout.
Real or open future possibility	si + present	future	Si tu viens, je serai content.
Condition followed by an instruction	si + present	imperative	Si tu as faim, prends un fruit.
Imagined or unlikely present/future situation	si + imparfait	present conditional	Si j'avais le temps, je viendrais.

The names “real” and “unreal” describe how the speaker presents the situation, not what is objectively possible. Compare:

• Si j'ai le temps, je viendrai. — I may have time; coming remains a real possibility.
• Si j'avais le temps, je viendrais. — I imply that I do not have time, or that having time seems unlikely.

Pattern 1: si + present

Use the present in the si clause when the condition is treated as a fact, a recurring situation, or an open possibility.

Present in both clauses

For general truths and repeated results, both verbs can be present:

• Si je travaille tard, je prends le dernier métro. — If I work late, I take the last metro.
• Si on mélange du bleu et du jaune, on obtient du vert. — If you mix blue and yellow, you get green.

The present can also describe an immediate result: Si tu veux, on part maintenant (“If you want, we can leave now”). French often uses a simple present where an English translation naturally uses “can” or another modal verb.

Present condition, future result

When the condition concerns a real future possibility, keep the verb after si in the present and put the result in the future:

• Si tu viens demain, je préparerai le dîner. — If you come tomorrow, I will make dinner.
• Nous irons nous promener s'il ne pleut pas. — We will go for a walk if it does not rain.

Do not copy the English future result into the condition clause. French says si tu viens, not si tu viendras, in this ordinary pattern.

The futur proche (aller + infinitive, the near-future form) is also possible in the result when it fits the context: Si tu continues, tu vas tomber (“If you carry on, you're going to fall”).

Present condition, imperative result

Use the imperative (the command or instruction form) when the result tells someone what to do:

• Si tu vois Léa, appelle-moi. — If you see Léa, call me.
• Si vous avez des questions, écrivez-nous. — If you have any questions, write to us.

Pattern 2: si + imparfait → present conditional

Use this pairing for an imagined present or future situation and its hypothetical result:

si + subject + imparfait, subject + present conditional

• Si j'étais riche, j'achèterais une maison. — If I were rich, I would buy a house.
• Si nous habitions plus près, nous nous verrions souvent. — If we lived closer, we would see each other often.

The imparfait in the condition does not place the imagined situation in the past. In Si j'avais plus de temps maintenant, avais refers to the present. It signals that the condition is remote from reality. The conditional in the result expresses what would follow.

The present conditional uses the future stem plus the imparfait endings: -ais, -ais, -ait, -ions, -iez, -aient. For example, venir has the future/conditional stem viendr- and gives je viendrais. This article builds on the Present Conditional.

Clause order and punctuation

Either clause can come first without changing the basic meaning:

• Si tu viens, je serai content.
• Je serai content si tu viens.

When the si clause comes first, a comma makes the sentence easier to read. When it follows the result, a comma is usually unnecessary. Changing the order does not change the tense pattern.

Si becomes s' only before il and ils

French contracts si before il and ils:

• s'il vient — if he comes
• s'ils acceptent — if they accept

It normally remains unchanged before other pronouns and words: si elle vient, si on accepte, si Antoine appelle. Forms such as s'elle are incorrect in standard French.

Examples in Context

French	English	Note
Si tu viens, je serai content.	If you come, I'll be happy.	Open future possibility
Si j'ai assez d'argent, je réserverai une chambre.	If I have enough money, I'll book a room.	Present condition, future result
S'il fait beau, on déjeune dehors.	If the weather is nice, we eat outside.	Habit or usual choice
Si vous appuyez sur ce bouton, la machine s'arrête.	If you press this button, the machine stops.	General result
Si tu as froid, ferme la fenêtre.	If you're cold, close the window.	Imperative result
Appelez-moi si vous arrivez en retard.	Call me if you arrive late.	Result clause comes first
Si j'avais le temps, je viendrais.	If I had time, I would come.	Imagined present situation
Si j'étais riche, j'achèterais une maison.	If I were rich, I would buy a house.	Contrary to the current facts
Si nous habitions plus près, nous nous verrions chaque semaine.	If we lived closer, we would see each other every week.	Hypothetical situation and result
Que ferais-tu si tu trouvais ce portefeuille ?	What would you do if you found this wallet?	Hypothetical question
Si elle connaissait la réponse, elle nous la donnerait.	If she knew the answer, she would give it to us.	Negative implication: she probably does not know
Si jamais tu changes d'avis, préviens-moi.	If you ever change your mind, let me know.	Si jamais stresses a possible eventuality
Au cas où tu aurais besoin d'aide, voici mon numéro.	In case you need help, here is my number.	Au cas où + conditional
Je prends un parapluie au cas où il pleuvrait.	I'm taking an umbrella in case it rains.	Precaution against a possibility

Common Mistakes

Putting the conditional directly after si

• Wrong: Si j'aurais le temps, je viendrais.
• Right: Si j'avais le temps, je viendrais.
• Why: In a standard hypothetical condition, use the imparfait after si and the conditional in the result. A useful memory line is: les si n'aiment pas les -rais — “si clauses do not like conditional endings.”

Using the future after si

• Wrong: Si tu viendras demain, je serai content.
• Right: Si tu viens demain, je serai content.
• Why: For an open future condition, French uses the present after si, even though the meaning is future. The future belongs in the result clause.

Using the present conditional in both clauses

• Wrong: Si nous habiterions près, nous nous verrions souvent.
• Right: Si nous habitions près, nous nous verrions souvent.
• Why: The condition takes the imparfait; only the hypothetical result takes the present conditional.

Confusing a real possibility with an imagined one

• Less suitable: Si j'avais le temps ce soir, je t'appellerais when you simply mean that you do not yet know your schedule.
• Better for an open possibility: Si j'ai le temps ce soir, je t'appellerai.
• Why: The present + future pattern leaves the possibility open. The imparfait + conditional often suggests doubt, distance, or a condition that is not currently true.

Contracting si before the wrong word

• Wrong: S'elle est libre, elle viendra.
• Right: Si elle est libre, elle viendra.
• Why: Si contracts only before il and ils: s'il, s'ils.

Treating au cas où like an ordinary si clause

• Wrong: Au cas où tu as besoin d'aide, appelle-moi.
• Standard form: Au cas où tu aurais besoin d'aide, appelle-moi.
• Why: Au cas où normally introduces the conditional, unlike ordinary si in a condition. It means “in case,” often with the idea of taking a precaution.

Usage Notes

Si jamais: “if ever” or “if by any chance”

Si jamais strengthens the sense of a possible eventuality. Depending on tone, it can sound neutral, cautious, or warning-like:

• Si jamais tu as un problème, appelle-moi. — If you ever have a problem, call me.
• Si jamais il refusait, nous chercherions une autre solution. — If he happened to refuse, we would look for another solution.

It follows the same tense patterns as ordinary si. Use the present for an open possibility and the imparfait for a more remote hypothesis.

Au cas où: planning for a possibility

Au cas où means “in case” and is followed by the conditional in careful standard usage:

• Garde le reçu au cas où tu voudrais échanger l'article. — Keep the receipt in case you want to exchange the item.
• Je t'envoie l'adresse au cas où tu te perdrais. — I'll send you the address in case you get lost.

It often accompanies a precaution already taken. A short standalone au cas où is common in speech: Prends une veste, au cas où (“Take a jacket, just in case”).

Not every English “if” is a condition

French si also introduces an indirect yes/no question, where it means “whether”: Je ne sais pas s'il viendra (“I don't know whether he will come”). This is not a condition, so the conditional-clause rules do not automatically apply. For example, Je me demandais s'il viendrait (“I was wondering whether he would come”) correctly contains si followed by a conditional. Here viendrait is reported future-in-the-past, not the condition in an if-then sentence.

In informal speech, you may hear tense combinations that differ from the careful standard patterns. For clear speaking and writing, use the standard pairings taught above.

Beyond the Basics / Advanced Use

Completed conditions with si + passé composé

A real condition can concern an action that must be completed first. French may use the passé composé (the common compound past tense) after si:

• Si tu as fini, tu peux partir. — If you have finished, you can leave.
• Si elle a reçu mon message, elle répondra bientôt. — If she received my message, she will reply soon.

This remains a real or open condition; it is not the same as an unreal past hypothesis.

Unreal conditions in the past

To imagine a past that did not happen, French uses si + plus-que-parfait → past conditional:

• Si j'avais su, je serais venu. — If I had known, I would have come.
• Si elle était partie plus tôt, elle aurait attrapé le train. — If she had left earlier, she would have caught the train.

The plus-que-parfait is the “had done” tense, and the past conditional is the “would have done” form. This B2 pattern is covered separately under Past Conditional Sentences.

Mixed time references

Sometimes the condition belongs to one time and the result to another. A past event may explain a present hypothetical result:

• Si j'avais accepté ce poste, j'habiterais à Lyon maintenant. — If I had accepted that job, I would be living in Lyon now.

Or a continuing present situation may have a hypothetical past consequence:

• Si elle était moins distraite, elle n'aurait pas oublié le rendez-vous. — If she were less absent-minded, she would not have forgotten the appointment.

These mixed conditionals are useful, but first make the two core B1 pairings automatic.

Alternatives that change the tone

French can express a condition without si:

• Avec un peu plus de temps, je finirais ce soir. — With a little more time, I would finish tonight.
• À ta place, je refuserais. — If I were you, I would refuse.
• En travaillant régulièrement, tu progresseras. — By working regularly, you will improve.

These are not exceptions to the si rules; they are different ways to package the same logical relationship. They are especially common when French speakers want concise or stylistically varied sentences.

Practice Tips

1. Learn tense pairs, not isolated translations. Make two columns headed si + présent → futur/présent/impératif and si + imparfait → conditionnel. Add five sentences from your own life to each.
2. Change the speaker's attitude. Start with an open possibility such as Si j'ai le temps, je sortirai, then make it remote: Si j'avais le temps, je sortirais. Say what changes in meaning, not just which endings change.
3. Listen for the clause after si. In a podcast or conversation, pause mentally after si and identify present, imparfait, or a compound tense. Then predict the likely tense of the result before you hear it.

Related Concepts

• Prerequisite: Present Conditional — forms the hypothetical result in si + imparfait sentences.
• Useful foundation: Simple Future — expresses the result of an open future condition.
• Next step: Past Conditional — supplies the “would have” form for unreal past results.
• Next step: Past Conditional Sentences — develops si + plus-que-parfait → conditionnel passé and mixed conditionals.