Passé composé vs imparfait in French: the simple rule

Everyone hesitates between "I ate" and "I was eating." The good news: you can decide in a few seconds by asking yourself the right questions. Here’s the simple rule, followed by pairs of examples that will click.

The rule in plain terms

The passé composé describes a completed action that is often seen as an event. It moves the story forward. The imparfait describes a framework: an ongoing action, a habit, a state in the past. It sets the scene, without indicating where it stops. If you visualize a series of points on a timeline, think passé composé. If you see a continuous line or a background on which something else happens, think imparfait.

• Passé composé: finished action, visible result, sequence of events.
• Imparfait: description, habit, ongoing action, or lasting state.

Same phrase, different meaning

Both tenses can use the same verbs, but the perspective changes. Look at these pairs: only the verb form changes, and the meaning shifts.

The 3 questions to ask

1. Is it a unique and completed action, or a habit/state? Unique and completed → passé composé. Habit/state/background → imperfect.
2. Is the duration defined (specific time, number of times) or vague? Defined/counting occurrences → passé composé. Vague/continuous → imperfect.
3. Are we talking about a new event that occurs, or from the context already in place? New event → past tense. Context/background → imperfect.

The pitfalls and nuances

Two classic pitfalls.

1. State verbs (être, savoir, vouloir, penser) are very often in the imperfect to describe a background: "I was tired", "I wanted to leave".
2. The interruption: we use the imperfect for the ongoing action and the past tense for what interrupts it: "I was eating when he knocked". Also pay attention to time complements: "for two hours" frames the activity (imperfect possible if background), but if you emphasize the counted completion, the past tense returns: "I worked for two hours and I finished."

My experience

At first, I forced the imperfect everywhere to "make it literary". Result: lifeless narratives. The breakthrough came when I started drawing a small timeline: continuous background (imperfect), events as points (past tense). As soon as I ask myself "does this move the story forward, right now?", I decide more quickly. And I reread myself looking for hidden "suddenly": if they exist, I switch back to the past tense. Simple, but it really helped me.

How to practice

Take 5 sentences from your daily life and write them twice: one version event in the past tense, one version background/habit in the imperfect. Then read aloud: if the background version seems to set a scene, you are on the right track. You can also practice in the Conjugation module of Discus: choose the tenses to work on and the app randomly picks from them (see the feature).

To go further

From an aspectual point of view, the past tense generally realizes a perfective aspect: it presents the process as completed, often with a result effect.

The imperfect expresses an imperfective aspect: it highlights the durativity, iteration, or incompleteness. In French, aspect is not marked by dedicated morphemes as in some languages: it emerges from the choice of tense and context.

The simple past persists in written narration to link perfective events without returning to the narrative present; it creates a distance and stylistic continuity, as confirmed by the usual literary style recommendations according to the Académie française. Finally, nuance with the pluperfect: it combines the past and anteriority ("I had eaten") to indicate that a fact is anterior to another past reference point, while remaining perfective.

Thus, one can articulate imperfect (framework), pluperfect (anteriority), and passé composé or simple past (events) for precise narration.