Vidéo sur la différence entre le passé composé et l'imparfait

French passé composé vs imparfait: when to use each

The passé composé and the imparfait are the two most common past tenses in French, and choosing between them changes the meaning of a sentence. As a rule, the passé composé tells a single, completed action, while the imparfait describes the setting, a habit or an action in progress. This page explains when to use each, how the two tenses work together, the signal words, the verbs that change meaning, common mistakes, a quick self-test and three interactive exercises right on the page.

In this lesson

The rule in one sentence
When to use the imparfait
When to use the passé composé
The two together
Signal words
Verbs that change meaning
Common mistakes
Self-check
FAQ
Key takeaways
Exercises

The rule in one sentence

Imparfait = the setting, the habit, the action in progress (the background). Passé composé = the single, completed action that moves the story forward (the event).

When to use the imparfait

Use the imparfait to set the scene and describe the past without stating where the action begins or ends.

Use	Example
Description, setting	Il faisait beau et les oiseaux chantaient. (The weather was nice and the birds were singing.)
Habit, repetition	Quand j’étais petit, je jouais au foot tous les jours.
Action in progress	Elle lisait tranquillement dans le salon.
Physical or mental state	J’étais fatigué et j’avais faim.

When to use the passé composé

Use the passé composé for a specific, completed action that happened at a given moment.

Use	Example
Single completed action	Hier, j’ai vu un bon film. (Yesterday I saw a good film.)
Sequence of actions	Il est entré, a posé son sac et s’est assis.
Action with a set duration	Nous avons habité à Paris pendant trois ans.
Event that breaks a description	Je dormais quand le téléphone a sonné.

The two together

Very often the imparfait sets the scene and the passé composé brings the event that interrupts it.

Example: « Je marchais dans la rue (background, imparfait) quand j’ai rencontré Marie (event, passé composé). » The imparfait lasts, the passé composé pops up.

Signal words

Some words often point towards one tense rather than the other.

Imparfait	Passé composé
souvent (often), d’habitude (usually)	soudain (suddenly), tout à coup
tous les jours (every day), chaque...	une fois (once), un jour (one day)
autrefois (in the past), à l’époque	hier (yesterday), ce matin-là
pendant que (while)	quand (when, brief action)

The classic trap: these words are only a clue, not an absolute rule. It is the meaning (single action or background) that decides, not the word alone.

Verbs that change meaning

A few verbs shift in nuance depending on the tense.

Verb	Imparfait	Passé composé
savoir	je savais = I knew (had the information)	j’ai su = I found out
connaître	je connaissais = I already knew (a person)	j’ai connu = I met for the first time
vouloir	je voulais = I wanted (intended)	j’ai voulu = I decided / tried
pouvoir	je pouvais = I could (was able)	j’ai pu = I managed to

Common mistakes

Imparfait for a single action. « Hier, je voyais un film » → « Hier, j’ai vu un film. »
Passé composé for a description. « Il a fait beau et les oiseaux ont chanté » (setting) → « Il faisait beau et les oiseaux chantaient. »
Passé composé for a habit. « Quand j’étais petit, j’ai joué tous les jours » → « je jouais tous les jours. »
Swapping background and event. « Je marchais quand je rencontrais Marie » → « je marchais quand j’ai rencontré Marie. »
Imparfait after a set duration. « J’habitais à Paris pendant trois ans » → « j’ai habité à Paris pendant trois ans. »

Knowing the rule is one thing; choosing the right tense while speaking, without hesitating, is another. Book a free trial lesson and practise with a native teacher, no credit card needed.
Book a free trial lesson

Self-check

Choose the right tense, then reveal the answers.

Quand j’étais petit, je (jouer) ____ au parc tous les jours.
Hier soir, nous (regarder) ____ un film.
Il (lire) ____ quand le téléphone (sonner) ____.

Show the answers

1. je jouais (habit). · 2. nous avons regardé (single action). · 3. Il lisait (background) quand le téléphone a sonné (event).

FAQ

What is the difference between the passé composé and the imparfait?

The passé composé expresses a single, completed action; the imparfait describes the setting, a habit or an action in progress. The first moves the story forward, the second describes it.

How do I choose between them in the same sentence?

The imparfait sets the background and the passé composé brings the event that interrupts it: « Je dormais quand le téléphone a sonné. » (I was sleeping when the phone rang.)

Which words signal the imparfait?

Often: souvent, d’habitude, tous les jours, autrefois, pendant que. But they are only clues: meaning decides.

Why don’t « j’ai su » and « je savais » mean the same thing?

« Je savais » = I already had the information (a state). « J’ai su » = I found out at a precise moment (an event). The same goes for connaître, vouloir, pouvoir.

Can the passé composé express a duration?

Yes, if the duration is set and finished: « J’ai habité à Paris pendant trois ans. » The imparfait is used for an open-ended duration.

Key takeaways

Imparfait = setting, habit, action in progress, state (the background).
Passé composé = single, completed action that moves the story forward.
The two together: imparfait (was happening) + passé composé (happened).
Signal words are clues, not rules: meaning decides.
Some verbs change meaning: savoir, connaître, vouloir, pouvoir.

Exercises

Exercise 1. Conjugate the verbs in brackets in the right tense.

Exercise 2. Choose the correct answer.

Exercise 3. Correct the mistakes.

Written and reviewed by the native teachers of Live French, online since 2007.