The French future tense (le futur simple): one rule, nine rebels, one trap

English builds the future with two words — “will” plus a verb. French does it with one: je partirai, tu verras, nous serons. Le futur simple runs on one formation rule, a short list of rebel stems, and one trap that catches every English speaker.

One rule: infinitive + the endings of avoir

Take the infinitive, add -ai, -as, -a, -ons, -ez, -ont. Done. Those endings are simply the present tense of avoir (with avons and avez trimmed to -ons and -ez): historically, je parlerai was parler + ai — “to speak, I have”.

• parler → je parlerai, tu parleras, elle parlera
• finir → nous finirons, vous finirez, ils finiront

One detail for -re verbs: drop the final e first. prendre → je prendrai (I’ll take), attendre → tu attendras (you’ll wait). Every futur simple form has an r just before the ending — hear that r, and you’ve heard the future.

The famous irregular stems

A handful of verbs swap the infinitive for a special stem — the endings never change. Annoyingly, they’re the most common verbs in French, so memorise them once and you’re set for life:

• être → ser- : je serai (I will be)
• avoir → aur- : tu auras (you will have)
• aller → ir- : j’irai (I will go)
• faire → fer- : elle fera (she will do)
• venir → viendr- : je viendrai (I will come)
• voir → verr- : tu verras (you will see)
• pouvoir → pourr- : il pourra (he will be able to)
• devoir → devr- : nous devrons (we will have to)
• savoir → saur- : vous saurez (you will know)

File two impersonal classics with them: il y aura (there will be) and il faudra (it will be necessary).

Futur simple or futur proche?

You met le futur proche (aller + infinitive) long before this lesson — so which one do you use? Je vais partir presents the future as planned and already in motion: I’m going to leave, it’s decided. Je partirai presents it as a projection or a promise: I will leave, someday, and I mean it.

In everyday conversation, French strongly prefers the futur proche. The futur simple takes over in writing, forecasts and formal announcements — and in promises: Je ne le referai plus (I won’t do it again) carries far more weight than any “je vais”.

The quand rule English speakers always miss

English says “When I arrive, I’ll call you” — present tense after “when”. French refuses the disguise: if the action is in the future, the verb after quand goes in the future too.

• Quand j’arriverai, je t’appellerai. — When I arrive, I’ll call you. (Both verbs future!)
• Dès que tu sauras, dis-le-moi. — As soon as you know, tell me.

The same rule applies after dès que (as soon as), lorsque and une fois que. Say “quand j’arriverai” out loud until it stops feeling odd — in French, it’s the only correct option.

But si plays by the opposite rule

One little word never takes the futur simple: si (if). The pattern is si + present, with the future in the other clause: Si tu viens, on mangera ensemble (if you come, we’ll eat together). Never “si tu viendras”. Quand looks forward on both sides; si stays in the present and lets the result clause carry the future. The full system lives in the si clauses lesson.

Le futur simple in the wild

• Je t’appellerai ce soir. — I’ll call you tonight. (a promise)
• On verra bien. — We’ll see. (the unofficial motto of French patience)
• Il fera beau demain. — It’ll be nice out tomorrow. (pure forecast-speak)
• Tu comprendras plus tard. — You’ll understand later.
• Nous serons là à 20 heures. — We’ll be there at 8 p.m.
• Vous pourrez payer par carte. — You’ll be able to pay by card.
• Il y aura du monde. — There’ll be a crowd.

In real sentences

Read each one aloud, then tap 🔊 and shadow the audio — rhythm first, speed later.

Drill it: the futur proche · si-clauses · the conditional

FAQ

Do French people actually use the futur simple when they speak?

Less than your textbook implies. In conversation the futur proche does most of the work, and that’s what you should reach for first. But the futur simple is unavoidable for promises, predictions and everything after quand — and it’s everywhere in writing.

Why does prendre lose its final e?

All -re verbs do: the future stem must end in r, so the silent e has no reason to stay. Prendre → je prendrai, vendre → je vendrai. Write “je prendrerai” and a French teacher somewhere feels a disturbance.

Is “quand j’arriverai” really correct? It sounds wrong to my English ear.

It’s the only correct version. English hides the future after “when”; French states it. Trust the logic — the arriving hasn’t happened yet, so the verb is future. Your ear will adjust.

Futur simple or futur proche — a working rule?

Speech about plans already in motion → futur proche (je vais partir demain). Predictions, promises, schedules, writing → futur simple (il pleuvra, je reviendrai). Mixing them is rarely wrong; this split is just what natives do.

Where else do those irregular stems pay off?

The conditional uses the SAME stems with imparfait endings: je serai/je serais, j’aurai/j’aurais. Learn the stem once, collect two tenses.

Quick practice