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.
This is exactly what my Les temps essentiels pour parler français workbook is designed for. It includes a full chapter dedicated to PC vs Imparfait, 50 progressive exercises with detailed corrections, Camille's tips at every step, and a 30-Day Challenge to build the habit one exercise at a time.