Ouvrir, allumer or démarrer? “Turn on” depends on the object
Doors and windows take ouvrir / fermer, lights and devices take allumer / éteindre, cars and machines take démarrer / arrêter. With a one-question test, the two pairings to avoid (allumer le robinet, éteindre la porte), conduire vs démarrer, and what you will hear in Quebec.
🎯 In one line: French picks the verb by what you are opening or switching — doors and windows:
ouvrir / fermer; lights and devices:allumer / éteindre; cars and machines:démarrer / arrêter.
Why they get mixed up
- English already splits “open the door” from “turn on the light”, so the big risk is the edges: taps, apps, shops, cars.
- “Turn off the tap” is not
éteindre, “start the car” is notallumer, and “drive” is notdémarrer. French does not have a catch-all verb: the verb follows the object. - There are only three groups, and one question settles it.
Which verb for which object
| Object | On / open | Off / close |
|---|---|---|
| Door · window | ouvrir la porte (open the door) | fermer la fenêtre (close the window) |
| Tap | ouvrir le robinet (turn on the tap) | fermer le robinet (turn off the tap) |
| File · app | ouvrir un fichier (open a file) | fermer l'appli (close the app) |
| Shop hours | Ça ouvre à 9 h. (It opens at 9.) | Ça ferme à 20 h. (It closes at 8 p.m.) |
| Light | allumer la lumière (turn on the light) | éteindre la lumière (turn off the light) |
| TV · computer | allumer la télé (turn on the TV) | éteindre l'ordi (turn off the computer) |
| Car · machine | démarrer la voiture (start the car) | arrêter le moteur (switch off the engine) |
🔑 The two pairs that cover daily life: doors and windows
ouvrir / fermer, lights and devicesallumer / éteindre.
One question to decide
| Ask yourself | Verb | Typical objects |
|---|---|---|
| Can you see inside, go in or out? | ouvrir / fermer | door, window, box, tap, file, book |
| Does it light up, does it run on power? | allumer / éteindre | light, TV, computer, phone, heating |
| Does it have to start turning or running? | démarrer / arrêter | car, engine, washing machine |
- The original meaning of
allumeris “to light, to set fire to”: allumer une bougie (light a candle), éteindre le feu (put out the fire). - “Lighting up, powering on” grew out of that — which is why lights and devices never take
ouvririn standard French.
Two pairings to avoid
| ❌ | ✅ | Why |
|---|---|---|
| ouvrir le robinet | a tap is opened, it does not light up | |
| fermer la porte | a door does not light up, it closes |
Cars: three verbs
| Action | Verb | Example |
|---|---|---|
| Drive | conduire | Je conduis tous les jours. (I drive every day.) |
| Start the engine | démarrer la voiture | La voiture ne démarre pas. (The car will not start.) |
| Unlock / open the doors | ouvrir la voiture | Tu peux ouvrir la voiture ? (Can you open the car?) |
- ⚠️ To say “I drive to work”: Je vais au travail en voiture. No need for a driving verb at all, and never
ouvrir.
arrêter: two uses
| Structure | Meaning | Example |
|---|---|---|
| arrêter + noun | stop (a machine) | arrêter la machine (stop the machine) |
| arrêter de + infinitive | stop doing something | arrêter de fumer (quit smoking) |
- The second use takes de + infinitive; it has nothing to do with devices, but it is just as common.
What you will hear in Quebec
In Quebec, ouvrir / fermer is commonly used for lights and the TV. It is everyday spoken usage, not a mistake:
| Spoken Quebec French | Standard (use this in the exam) | Meaning |
|---|---|---|
| ouvrir la lumière | allumer la lumière | turn on the light |
| fermer la lumière | éteindre la lumière | turn off the light |
| fermer la télé | éteindre la télé | turn off the TV |
- In a listening task, Ferme la lumière simply means “turn off the light”.
- When you write or speak yourself,
allumer / éteindreis the safest choice: it works everywhere. - Doors and windows have no regional twist:
ouvrir / fermerla porte everywhere.
Shortcut
Ask what you are opening: things you see into or pass through → ouvrir / fermer; things that light up or run on power → allumer / éteindre; things that have to start turning → démarrer / arrêter. Driving itself is conduire. In Quebec the light can be opened and closed in speech, but in writing allumer / éteindre is the safe choice.