Cheat sheet

Certain or sûr: a French certainty cheat sheet

Compare certain and sûr for confidence, sûre for reliability and certaines for some. A printable reference, a short exchange and five questions fix the patterns.

In short

Je suis certain and je suis sûr both mean “I’m sure”. Sûr also means safe or reliable: un endroit sûr, une source sûre. Before a plural noun, certains or certaines can mean “some”: certaines personnes.

Yellow the idea to rememberBlue French to learn

Two colleagues confirm an arrangement at an office table.
Checking an arrangement gives j’en suis sûr a purpose. Illustration: Atelier

Certain et sûr · fiche de référence

1 · Sure about something: de

Use either adjective with de before a noun. Before a vowel, de becomes d’.

Je suis certain de la date.I’m certain about the date.

Elle est sûre de son choix.She is sure of her choice.

2 · Sure that something is true: que

In an affirmative certainty statement, que introduces the information.

Je suis sûr que la réunion commence à dix heures.I’m sure the meeting starts at ten.

Elle est certaine que cette information est exacte.She is certain this information is accurate.

3 · Sure of it: en

En stands for the information already mentioned. Keep it before the verb.

Tu es sûre de la date ? — Oui, j’en suis sûre.Are you sure about the date? — Yes, I’m sure of it.

Je n’en suis pas certain.I’m not certain about it.

4 · Reliable or safe: sûr

These meanings fit sûr. Learn the whole noun phrase.

une source sûrea reliable source
un endroit sûra safe place

Nous cherchons une source sûre pour vérifier la date.We’re looking for a reliable source to check the date.

5 · Some or a certain: certain before a noun

Here the word selects people or things; it gives a different meaning from confidence.

Certaines personnes ont reçu un message.Some people received a message.

Il faut un certain temps pour tout vérifier.It takes a certain amount of time to check everything.

Agreement and the accent
Masculine singularFeminine singularMasculine pluralFeminine plural
certaincertainecertainscertaines
sûrsûresûrssûres
Vérifier l’heure
  1. Léa

    La réunion commence à dix heures ? Tu en es sûr ?

    Does the meeting start at ten? Are you sure?

  2. Karim

    Oui, j’en suis certain. J’ai reçu le message de l’organisatrice.

    Yes, I’m certain. I received the organiser’s message.

  3. Léa

    D’accord. Certaines personnes ont encore l’ancien horaire.

    OK. Some people still have the old time.

Le message est sur la table. Je suis sûre de l’heure.

The message is on the table. I’m sure about the time.

Sur without an accent is a preposition. Sûre with the accent is the feminine adjective.

Question 1No account needed
A woman says “I’m sure”. Choose the adjective.Je suis ___.

Choose one answer.

Answer and explanation

sûre. The adjective agrees with the woman speaking: sûre.

Question 2No account needed
Complete the phrase about reliability.Une source ___.

Choose one answer.

Answer and explanation

sûre. The phrase for a reliable source is une source sûre.

Question 3No account needed
Translate certaines personnes.

Choose one answer.

Answer and explanation

Some people. Before personnes, certaines means some people.

Question 4No account needed
Complete “I’m sure of it”.J’___ suis sûr.

Choose one answer.

Answer and explanation

en. En replaces de cette information: j’en suis sûr.

Question 5No account needed
Choose the preposition meaning “on”.Le message est ___ la table.

Choose one answer.

Answer and explanation

sur. Sur is the preposition; sûr and sûre are adjectives.