FrenchConjugationFutur

Savoir (to know) · Futur

By TutorLily Editorial Team · Last updated May 29, 2026

Savoir in the French futur simple is: je saurai, tu sauras, il/elle/on saura, nous saurons, vous saurez, ils/elles sauront. The futur simple of savoir uses the irregular contracted stem 'saur-'. 'Je saurai demain' = 'I will know / find out tomorrow'. Same stem powers the conditionnel ('je saurais').

savoir conjugation in the Futur Simple
To Know	Savoir
I will know	je saurai
you will know	tu sauras
he/she will know	il/elle/on saura
we will know	nous saurons
you will know	vous saurez
they will know	ils/elles sauront

Examples

Savoir (to know) in context

Sentences that use savoir in the futur. Tap each to hear it.

Demain je saurai les résultats.

Tomorrow I will know the results.

Tu sauras quoi faire le moment venu.

You will know what to do when the time comes.

Il saura s'adapter à la situation.

He will know how to adapt to the situation.

Nous saurons la décision finale vendredi.

We will know the final decision on Friday.

Vous saurez très bientôt.

You will know very soon.

Ils sauront trouver la solution.

They will know how to find the solution.

Tip

Working with the futur

The futur simple ("je parlerai") describes future actions, predictions, and conjecture about the present. In conversation it competes with the futur proche ("je vais parler" — going-to future), which is more common for near-term plans. Use the futur simple for distant or formal futures ("un jour, je voyagerai en Asie") and for conjecture ("il sera fatigué" = he must be tired). The futur stem is the full infinitive for regular verbs (parler-, finir-, vendr-), with a small set of irregular stems for high-frequency verbs: être → ser-, avoir → aur-, aller → ir-, faire → fer-, savoir → saur-, pouvoir → pourr-, vouloir → voudr-, venir → viendr-, devoir → devr-, voir → verr-.

Questions

Frequently asked questions

How do you conjugate savoir in the futur?

The futur of savoir uses 'saur-': je saurai, tu sauras, il/elle/on saura, nous saurons, vous saurez, ils/elles sauront. The infinitive 'savoir' contracts to 'saur-' — same family as avoir → aur- and pouvoir → pourr-.

Why is the futur stem 'saur-' instead of 'savr-'?

A handful of high-frequency French verbs developed contracted future stems for phonetic economy: avoir (aur-), savoir (saur-), pouvoir (pourr-), cabbat → cabr-, voir (verr-), devoir (devr-). Same pattern as Spanish saber → sabré. The 'v' of the infinitive drops to ease pronunciation.

When do I use 'je saurai' instead of 'je vais savoir'?

Both express future knowing. 'Je saurai' (futur simple) feels slightly more formal or further in time. 'Je vais savoir' (futur proche) is more conversational. The futur simple also expresses conjecture: 'il saura sûrement' (he'll surely know — prediction).