Expressing cause — parce que car puisque grâce à

six routes, each with its own placeB1

In one line

parce que is followed by a clause, à cause de by a noun — and the choice between them depends on whether the cause is a clause or a noun.

English marks the same split with "because" and "because of". "Because it rained" (clause) versus "because of the rain" (noun). French does the same thing with two entirely different words — parce que and à cause de — which is why they get mixed up.

The forms on this page

FormMeansSound
parce quebecause — followed by a full clause/paʁs.kə/
carfor — written register, and never starts a sentence/kaʁ/
puisquesince — a reason the listener already knows/pɥis.kə/
grâce àthanks to — only for a positive cause/ɡʁa.s‿a/

The table

WordWhat followsToneExample
parce que /paʁs.kə/a clauseneutral… parce qu'il pleut.
car /kaʁ/a clause (written)neutral…, car il pleut.
puisque /pɥis.kə/a clause (a known cause)neutralPuisque tu es là, aide-moi. /pɥisk ty ɛ la ɛd mwa/
comme /kɔm/a clause (sentence-initial)neutralComme il pleut, je reste. /kɔ.m‿il plø ʒə ʁɛst/
à cause de /a koz də/a nounnegativeÀ cause de la pluie. /a koz də la plɥi/
grâce à /ɡʁa.s‿a/a nounpositiveGrâce à toi. /ɡʁas a twa/
en raison de /ɑ̃ ʁɛ.zɔ̃ də/a noun (formal)neutralEn raison de la grève. /ɑ̃ ʁɛ.zɔ̃ də la ɡʁɛv/
étant donné /e.tɑ̃ dɔ.ne/a noun (formal)neutralÉtant donné la situation. /e.tɑ̃ dɔ.ne la si.ty.a.sjɔ̃/
vu /vy/a noun (brief)neutralVu l'heure, je pars. /vy lœʁ ʒə paʁ/

Four conjunctions, four uses

parce que — the answer to "why"

Pronunciation
— Pourquoi tu pars ? — Parce que j'ai froid.the one place it opens a sentence/puʁ.kwa ty paʁ/ · /paʁs.kə ʒe fʁwa/
Je pars parce que j'ai froid.its usual position/ʒə paʁ paʁs kə ʒe fʁwa/

❌ Parce que j'ai froid, je pars. — not accepted in writing.

English "because" opens sentences freely, which is why this is one of the most frequent errors. Use comme there.

car — written only, never sentence-initial

Je pars, car j'ai froid.

Always with a comma before it, always after the main clause. It is virtually unused in speech.

English "for" in the sense of "because" behaves identically — "I'm leaving, for I am cold" — and is equally literary.

puisque — when both parties already know the cause

Pronunciation
Puisque tu es là, aide-moi.since you're here — the cause is obvious/pɥisk ty ɛ la ɛd mwa/
Puisque tu insistes, d'accord.since you insist/pɥis.kə ty ɛ̃.sist da.kɔʁ/

The difference from parce que: parce que gives new information; puisque refers to something already established.

This is exactly English "since" versus "because" — "since you're here, help me" — and English draws the line the same way.

comme — cause, always sentence-initial

Comme il pleut, je reste à la maison.

comme never appears mid-sentence in this sense. Mid-sentence it means "like", not "because".

à cause de versus grâce à

Their only difference is the tone of the outcome, and it is marked in exams:

Pronunciation
Grâce à toi, j'ai réussi.thanks to you, I passed/ɡʁɑ.s‿a twa ʒe ʁe.y.si/
À cause de toi, j'ai raté.because of you, I failed/a koz də twa ʒe ʁa.te/
En raison de la grève, le train est annulé.formal and neutral/ɑ̃ ʁɛ.zɔ̃ də la ɡʁɛv lə tʁɛ̃ ɛ.t‿a.ny.le/

English has the same pair — "thanks to" and "because of" — but treats it loosely. English will say "because of you I passed" without anyone objecting. French will not: à cause de carries blame, and using it for a good outcome sounds wrong.

à cause de and contraction

à cause du bruit /a koz dy bʁɥi/de + le
à cause des enfants /a koz de.z‿ɑ̃.fɑ̃/de + les
grâce au professeur /ɡʁas o pʁo.fɛ.sœʁ/à + le
grâce aux conseils /ɡʁas o kɔ̃.sɛj/à + les

Two routes with no conjunction at all

With en effet

Il n'est pas venu. En effet, il était malade.

en effet explains, but it is not a conjunction — it is a separate sentence.

With a participle or an adjective

Fatigué, il est rentré tôt. — being tired, he went home early Ayant fini son travail, il est parti. — having finished his work, he left

This structure is formal and scores well in writing. The detail is in gerondif-participe.

English does both of these — "Tired, he went home", "Having finished, he left" — so they need no learning, only remembering that they are available.

Examples

EnglishFrenchPronunciation
I'm leaving because I'm cold.Je pars parce que j'ai froid./ʒə paʁ paʁs kə ʒe fʁwa/
Why? Because it's late.Pourquoi ? Parce qu'il est tard./puʁ.kwa paʁs ki.l‿ɛ taʁ/
I'm leaving, for I'm tired.Je pars, car je suis fatigué./ʒə paʁ kaʁ ʒə sɥi fa.ti.ɡe/
Since you're here, help me.Puisque tu es là, aide-moi./pɥisk ty ɛ la ɛd mwa/
Since it's raining, I'll stay.Comme il pleut, je reste./kɔ.m‿il plø ʒə ʁɛst/
I didn't go because of the rain.Je ne suis pas parti à cause de la pluie./ʒə nə sɥi pa paʁ.ti a koz də la plɥi/
Thanks to you, I passed.Grâce à toi, j'ai réussi./ɡʁɑ.s‿a twa ʒe ʁe.y.si/
Owing to the strike.En raison de la grève./ɑ̃ ʁɛ.zɔ̃ də la ɡʁɛv/
Given the time, I'm off.Vu l'heure, je pars./vy lœʁ ʒə paʁ/
Tired, he went home early.Fatigué, il est rentré tôt./fa.ti.ɡe i.l‿ɛ ʁɑ̃.tʁe to/

Common mistakes

❌✅Why
Parce que il pleut, je reste.Comme il pleut, je reste.parce que cannot open a sentence
Car il pleut, je reste.Je reste, car il pleut.car follows the main clause
à cause de la pluie j'ai réussigrâce à la pluieThe outcome is positive
parce que la pluieà cause de la pluieparce que needs a clause
à cause de le bruità cause du bruitThe contraction is compulsory
Comme je pars mid-sentenceparce que je parscomme is sentence-initial only

Why so many ways to say one thing

each one views the cause from a different angle

French sees cause from several angles, and each angle has its own word:

AngleWordPronunciation
the cause is new informationparce que/paʁs.kə/
the cause is already knownpuisque/pɥis.kə/
the cause is backgroundcomme/kɔm/
the cause is a written justificationcar/kaʁ/
the cause was badà cause de/a koz də/
the cause was goodgrâce à/ɡʁa.s‿a/

English has a word for nearly every one of these — because, since, as, for, thanks to, because of — and uses them interchangeably far more than French does. "Since it's raining" and "because it's raining" are equivalent in English; puisque and parce que are not equivalent in French.

In exams these distinctions earn marks, because they show you are thinking inside French rather than translating.

A useful exercise: write one sentence with all six and see which reads best. Usually one is clearly better than the rest.

And a structural test that always works:

conjunction + clause — parce que · car · puisque · comme preposition + noun — à cause de · grâce à · en raison de

If a conjugated verb follows, pick from the first group. If a noun follows, from the second. This is the same test as English "because" versus "because of".

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