puisque

Meaning

Gives a cause the other person ALREADY KNOWS: you lean on it to draw a conclusion.

Position and punctuation

within the sentence · no comma

Example

Puisque vous proposez un échange, je vous retourne l'article dès demain.

Since you are offering an exchange, I am returning the item tomorrow.

In the DELF

the B1 letter · the B2 essay

The trap

Parce que teaches the cause, puisque recalls it. So you do not write "Puisqu'il pleut" to someone who does not know it is raining.