The Core Rule: Event vs Background
Almost every choice between the passé composé and the imparfait comes down to one question: is this a completed event, or the background scene it happened in? The passé composé reports events — things that happened, finished, and moved the story forward. The imparfait describes the setting — what was going on, how things were, what was habitual.
Je lisais quand le téléphone a sonné.
I was reading when the phone rang. [Imparfait = background, passé composé = event]
That single sentence is the whole tense system in miniature. The reading was in progress (background, imparfait). The ringing was a completed moment (event, passé composé). If you can feel that contrast, you can choose correctly in most real sentences.
A mental picture
Think of a photograph. The imparfait is everything inside the frame that is not moving — the weather, the room, the people's moods. The passé composé is the action that happens while the camera is running.
How Each Tense Is Formed
Passé composé
Present tense of avoir or être + past participle. Most verbs take avoir; a small set of movement and reflexive verbs take être, and their participle agrees with the subject.
Imparfait
Take the nous form of the present, drop -ons, and add the imparfait endings: -ais, -ais, -ait, -ions, -iez, -aient.
Three Questions That Decide It
When you are mid-sentence and unsure, run these three checks in order. The first one resolves most cases on its own.
Chaque matin, je me levais à sept heures.
Every morning, I got up at seven. [Habitual → imparfait]
Hier, je me suis levé à sept heures.
Yesterday, I got up at seven. [Single event → passé composé]
Notice how the same verb flips tense purely on the strength of "chaque matin" versus "hier". That is the whole test in action.
Verbs That Change Meaning
A small group of verbs deliberately change meaning depending on the tense — which is the exam's favourite way to test whether you understand the distinction rather than just the form.
Je savais la réponse.
I knew the answer (state). [Imparfait]
J'ai su la réponse hier.
I found out the answer yesterday (event). [Passé composé]
Exam relevance
These meaning-shift verbs appear constantly in reading and translation tasks at GCSE, IGCSE, IB and DELF. Recognising that "j'ai pu" means "I managed to" rather than "I could" can be the difference between a correct and a wrong comprehension answer.
Signal Words That Give It Away
Certain time expressions almost always point to one tense. They are not absolute rules, but they are reliable enough to use as a first guess.
Common Mistakes
- Using the imparfait for everything past — the classic learner error, which makes stories feel static.
- Forgetting participle agreement with être verbs (elle est allée, not elle est allé).
- Mixing the two in a way that reverses the logic: events in the imparfait and background in the passé composé.
- Translating "was + -ing" literally into the passé composé instead of the imparfait.
Check your tenses
Paste a paragraph of past-tense French into the Lingaso writing analyser to spot tense inconsistencies and agreement slips before they become habits.How to Practise the Distinction
The fastest way to internalise the difference is to write the same short story twice — once as a description (imparfait-heavy) and once as a sequence of events (passé composé-heavy) — then combine them into one coherent narrative. This forces you to feel the boundary between background and event.
Il était une fois un petit village tranquille. Un jour, un étranger est arrivé.
Once upon a time there was a quiet little village. One day, a stranger arrived. [Scene set in imparfait, then the event in passé composé]
FAQ
Is the passé simple the same as the passé composé?
No. The passé simple is a literary past tense found in books and formal writing. In speech and in most exam writing you use the passé composé for completed events. Recognising the passé simple when reading is useful; producing it is rarely required outside literature papers.
What about the plus-que-parfait?
The plus-que-parfait (j'avais parlé) expresses an action completed before another past action. Use it when you need to show that one past event happened before another — it can combine with both the passé composé and the imparfait.
Do I need the imparfait in speaking exams?
Yes. Describing a scene, a past habit, or how you felt all rely on the imparfait. A speaking answer that only uses the passé composé sounds clipped and loses marks for range.