They are used to create more complex sentences and to show the relationships between ideas.
[1][2] Coordinating conjunctions are used to join words, phrases, or independent clauses of equal grammatical importance.
[4] Some common subordinating conjunctions in French include the subordintors que (that) and si (if), along with relative words such as quand (when), and prepositions such as puisque (since, as), parce que (because), comme (as, since), bien que (although, even though), avant que (before), après que (after), pendant que (while).
[2] They can be used to connect clauses or phrases and express relationships such as cause, condition, or concession.
Some common conjunctional phrases in French include: afin que (so that) à condition que (provided that) à moins que (unless), au cas où (in case), en dépit de (despite), pour que (so that, in order that), tant que (as long as).