If you have been learning French for more than a few weeks, you have hit this wall: you want to talk about the past, and French hands you two options: the passé composé and the imparfait. Every explanation you find online seems to contradict the last one.
This is, without question, the grammar point my adult students ask about most, at every level. So here is the guide I give them in private lessons. No jargon. Just the logic that actually works.
The mental image that changes everything
Before any rules, try this: imagine you are watching a film about someone's past. The imparfait is the background: the scenery, the weather, the mood, what was already happening when you arrived in the scene. The passé composé is the action: specific events that happen and are then done.
Il faisait beau ce matin-là quand j'ai vu l'accident.
It was beautiful that morning (imparfait: background) when I saw the accident (passé composé: the event).
One sentence. Both tenses. Both doing exactly their job. That is the whole system.
When to use the Passé Composé
Use the passé composé for:
- A completed action at a specific moment: J'ai mangé une pizza hier soir.
- An action that happened a specific number of times: Je suis allé à Paris trois fois.
- A sequence of events (one after another): Je me suis levé, j'ai pris une douche et j'ai bu mon café.
- An action that interrupts an ongoing one: Je lisais quand le téléphone a sonné.
Formation: avoir or être (present) + past participle. → J'ai mangé. Je suis parti(e).
When to use the Imparfait
Use the imparfait for:
- Describing the past scene or context: Il faisait froid, il n'y avait personne dans la rue.
- Habits and repeated actions in the past: Quand j'étais enfant, je jouais au foot tous les mercredis.
- States of mind, feelings or opinions: Elle était fatiguée. Il voulait rentrer.
- An ongoing action when something else happened: Je dormais quand tu as appelé.
Formation: take the nous form of the present, remove -ons, and add: -ais, -ais, -ait, -ions, -iez, -aient.
The signal words that give it away
Certain time expressions almost always point to one tense. Recognise them and half the battle is won.
| → Passé Composé | → Imparfait |
|---|---|
| soudain, tout à coup (suddenly) | toujours, souvent (always, often) |
| hier, ce matin (yesterday, this morning) | tous les jours, chaque semaine |
| une fois, deux fois (once, twice) | autrefois, quand j'étais jeune |
| enfin, finalement (finally) | d'habitude (usually) |
| pendant x minutes (a defined period) | pendant que (while: ongoing background) |
The trickiest case: emotions and states
This is where even B2 students hesitate:
- J'avais peur. → I was scared (ongoing state: imparfait)
- J'ai eu peur quand j'ai vu le chien. → I got scared when I saw the dog (the reaction = a specific event: passé composé)
Same emotion, two different tenses. The imparfait describes how things were. The passé composé describes what happened.
One tricky pair that surprises everyone
Compare these two sentences, they look almost identical but mean something different:
- J'ai habité à Paris pendant trois ans. → I lived in Paris for three years. (completed period: passé composé)
- J'habitais à Paris quand j'étais étudiant. → I used to live in Paris when I was a student. (ongoing past state: imparfait)
The passé composé marks a finished chapter. The imparfait describes how life was at that time.
Camille's quick test
When you are not sure, ask yourself one question: "Was this happening (background) or did this happen (event)?"
- "The sun was shining" → was happening → imparfait → Le soleil brillait.
- "She phoned me" → happened → passé composé → Elle m'a appelé.
- "I was tired" → state, background → imparfait → J'étais fatigué(e).
- "I fell asleep" → happened → passé composé → Je me suis endormi(e).
How to actually lock this in
Reading the rule once is not enough. The tenses only become automatic through structured practice: writing short stories, correcting yourself, and understanding why each answer is right.