Final answer:
The correlative conjunction in the given sentence is 'if/if'. It is used to join the two independent clauses expressing uncertainty or conditionality.
Step-by-step explanation:
The correlative conjunction in the given sentence is if/if. Correlative conjunctions are pairs of words that are used to join words or groups of words of equal importance within a sentence. In this case, the pair 'if/if' is used to join the two independent clauses 'I don't know if Montel will take Spanish' and 'I don't know if he will take French'. This pair of conjunctions is used to show the uncertainty or conditionality of both statements.