If you've been studying French for more than five minutes, you've probably run into this wall. There are two main past tenses in French, and they're both used constantly, and nobody can give you a straight answer about which one to use when.

Some teachers will tell you it's about completed actions versus ongoing ones. Others will say it's about specific moments versus background descriptions. Some will give you a list of "trigger words" to memorize. By the end, your head is spinning and you still don't really know when to use which.

I'm going to give you the simple rule that I teach my students, the one that finally makes it click. Then I'll walk you through the cases that always confuse English speakers, and by the end of this post, you'll never freeze on this choice again.

If you're not sure exactly what level you're at right now, you can take my free placement test here before we dive in.

The simple rule

Here it is, in one sentence: passé composé tells the story, imparfait paints the scene.

That's it. That's the whole thing.

Think of a movie. The passé composé is the action: the events that move the plot forward, the things that happened, the moments that changed something. The imparfait is everything else: the setting, the background, the descriptions, the way things were before the action interrupted them.

Once you understand this, every other "rule" you've ever learned about these tenses starts making sense. They're not separate rules. They're different ways of describing the same fundamental difference.

Let me show you what I mean with an example.

Hier soir, je regardais un film tranquillement quand mon téléphone a sonné. C'était ma sœur. Elle avait l'air paniquée. Elle m'a dit qu'elle avait besoin d'aide.

Last night, I was watching a movie quietly when my phone rang. It was my sister. She seemed panicked. She told me she needed help.

Look at the structure. Imparfait for the scene (I was watching, it was my sister, she seemed panicked, she needed help). Passé composé for the actions that moved the story forward (the phone rang, she told me).

If you take nothing else from this post, take that. Story = passé composé. Scene = imparfait.

Why English speakers get confused

The reason this distinction feels so hard is that English does it differently. We have two main past tenses too: simple past ("I watched") and past continuous ("I was watching"). But we don't always use them the way French uses passé composé and imparfait.

In English, you might say "Last summer, I went to Paris every weekend." One simple past tense, no ambiguity. In French, this becomes:

L'été dernier, j'allais à Paris tous les weekends.

Why imparfait? Because it's describing a habit, a repeated background pattern, not a single event. Even though English uses simple past, French sees it as scene-painting.

Or take this example:

"When I was a child, I lived in Lyon." Quand j'étais enfant, j'habitais à Lyon.

Both verbs in imparfait. Why? Because both are describing a state of being, a backdrop, not specific events. "I was a child" and "I lived in Lyon" are both ongoing situations, not actions.

This is the trap English speakers fall into: they translate "I lived" as a finished action, so they reach for passé composé. But "I lived in Lyon" is a description of a period of life, not a discrete event. It's scene-painting. So it's imparfait.

The four jobs of imparfait

Once you understand that imparfait paints the scene, the four classic uses become obvious. Imparfait is for:

1. Descriptions of how things were.

Il faisait beau. Le ciel était bleu. Tout le monde avait l'air heureux. The weather was nice. The sky was blue. Everyone seemed happy.

2. Habitual or repeated actions in the past.

Quand j'étais petite, je mangeais des croissants tous les dimanches. When I was little, I ate croissants every Sunday.

3. Ongoing actions that get interrupted.

Je dormais quand le téléphone a sonné. I was sleeping when the phone rang.

4. Mental states, emotions, and physical conditions.

Je voulais rentrer. J'avais froid. Je pensais à elle. I wanted to go home. I was cold. I was thinking about her.

All four of these are scene-painting. They describe how things were, not what happened.

The three jobs of passé composé

Passé composé tells the story. It's used for:

1. Specific completed actions.

Hier, j'ai vu un film. J'ai mangé une pizza. Je suis allée au lit. Yesterday, I watched a movie. I ate a pizza. I went to bed.

2. Actions that happened a specific number of times.

Je suis allée trois fois en France cette année. I went to France three times this year.

3. Actions that interrupt a scene.

Je marchais dans la rue quand j'ai vu mon ex. I was walking down the street when I saw my ex.

Notice how every one of these moves the story forward. Something happened. There's a clear beginning and end.

When the same verb can take either tense

This is where it gets fun. Some verbs change meaning slightly depending on which tense you choose. The classic examples:

Vouloir (to want)

Je voulais lui parler. — I wanted to talk to him. (Mental state, ongoing.) J'ai voulu lui parler. — I tried to talk to him / I decided to talk to him. (Specific moment of intention or attempt.)

Pouvoir (to be able to)

Je pouvais courir vite. — I was able to run fast. (Past ability, general state.) J'ai pu courir vite. — I managed to run fast. (Specific moment of success.)

Savoir (to know)

Je savais qu'il mentait. — I knew he was lying. (Ongoing knowledge.) J'ai su qu'il mentait. — I found out he was lying. (Specific moment of realization.)

Connaître (to know / be familiar with)

Je connaissais Paris. — I knew Paris (was familiar with it). J'ai connu Paris en 2010. — I got to know Paris / I first encountered Paris in 2010.

The pattern is the same as the main rule. Imparfait describes the state. Passé composé marks the moment.

How to choose in real time

Here's what I tell my students when they're constructing a sentence and they freeze on the choice. Ask yourself one question: Am I telling someone what happened, or am I describing how things were?

If you're answering "what happened next?" — passé composé. If you're answering "what was the situation?" — imparfait.

Try it on these examples before you read the answer:

1. Yesterday, I _____ (manger) at a Thai restaurant.
2. When I was twelve, I _____ (avoir) a cat named Minou.
3. I _____ (lire) a book when she _____ (entrer).
4. Last week, I _____ (voir) my sister three times.
5. The sun _____ (briller) and the birds _____ (chanter).

Answers:

1. J'ai mangé (something that happened — passé composé)
2. J'avais (description of a period — imparfait)
3. Je lisais, elle est entrée (scene + interruption — imparfait + passé composé)
4. J'ai vu (specific number of times — passé composé)
5. Brillait, chantaient (descriptions of the scene — imparfait)

If you got most of them right, congratulations, you've already internalized the rule. If you didn't, don't worry. This takes time and exposure to fully click. The more French you read and listen to, the more your gut will start choosing the right tense automatically.

The biggest mistake to avoid

The single most common mistake I see English speakers make is defaulting to passé composé for everything.

It happens because passé composé feels like the closest equivalent to English simple past, and English speakers want to translate. So they say:

❌ Quand j'ai été petite, j'ai habité à Lyon.

instead of:

✅ Quand j'étais petite, j'habitais à Lyon.

The first sentence isn't grammatically broken, but it sounds wrong to French ears. It's like saying "I have been little" instead of "I was little" in English. The tense doesn't fit the meaning.

If you find yourself defaulting to passé composé, slow down and ask: am I telling the story, or painting the scene? When in doubt, default to imparfait for descriptions, states, habits, and backgrounds. Use passé composé when you can clearly answer "and then what happened?"

If you want a refresher on French verbs more generally, my post on the 50 most useful French verbs to learn first is a good companion to this one.

Practice this week

The fastest way to internalize this rule is to use it deliberately. Try this:

Tell yourself a short story in French about something that happened to you yesterday. Out loud. Use both tenses on purpose. Set the scene with imparfait, then move the action with passé composé.

For example:

Hier matin, il pleuvait et je n'avais pas envie de sortir. Mais j'ai pris mon parapluie et je suis allée au café. Il y avait beaucoup de monde. Le serveur avait l'air fatigué. J'ai commandé un café et j'ai lu mon livre pendant une heure.

Notice how natural the rhythm becomes. Imparfait sets each scene (it was raining, I didn't feel like going out, there were lots of people, the server seemed tired). Passé composé carries the story (I took my umbrella, I went, I ordered, I read).

Do this every day for a week and you'll feel the difference.

You've got this

The passé composé vs imparfait choice isn't really about grammar rules. It's about how you see the moment you're describing. Are you narrating an event, or are you painting a backdrop?

Once your brain learns to ask that one question, the rest follows. You won't need to memorize lists of "trigger words" or worry about exceptions. You'll just feel which tense fits.

If you want a structured way to practice both tenses with examples, exercises, and feedback, you can try a free sample lesson from my course here and see exactly how I teach this in detail.

À très vite, Clémence