How to Use French Conjunctions of Conclusion

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The French conjunctions parce que, car, puisque, and comme are commonly used to draw conclusions or otherwise relate a cause or explanation with a result or conclusion. These conjunctions have similar but not identical meanings and uses. 

They fall into the two basic categories of conjunctions; coordinating, which join words or groups of words of equal value; and subordinating, which join dependent clauses to main clauses. Conjunctions of conclusion are one or the other, depending on the conjunction. 

Parce Que > Because

Parce que is a subordinating conjunction and can begin a sentence. Parce que introduces a cause, explanation, or motive. It basically explains why something is done.

Je ne suis pas venu parce que mon fils est malade.
I didn't come because my son is sick.

Parce qu'il n'a pas d'argent, il ne peut pas venir.
Because he doesn't have any money, he can't come.

Car > Because, For

Car is a coordinating conjunction, should not begin a sentence, and is mainly found in formal and written French. Car supports a judgment or indicates a reason.

La réunion fut annulée car le président est malade.
The meeting was canceled because the chairman is sick.

David ne va pas venir, car il est à l'université.
David isn't coming, for he is (away) at school.

Puisque > Since, Because

Puisque is a subordinating conjunction and can begin a sentence. Puisque gives an obvious explanation or justification, rather than a cause.

Tu peux partir puisque tu es malade.
You can leave, since you're sick.

Puisque c'était son erreur, il m'a aidé.
Since it was his mistake, he helped me.

Comme > As, Since

Comme is a subordinating conjunction and usually begins a sentence. Comme highlights the link between a consequence and its result.

Comme je lis le plus vite, j'ai déjà fini.
Since I read the fastest, I've already finished.

Comme il est faible, il ne pouvait pas le lever.
Since he is weak, he couldn't lift it.