1. Coordinating Conjunctions: These connect words, phrases, or clauses of equal grammatical rank. The most common coordinating conjunctions are FANBOYS:
* For
* And
* Nor
* But
* Or
* Yet
* So
2. Subordinating Conjunctions: These connect a dependent clause to an independent clause. Examples include:
* After, although, as, as if, as long as, as soon as, because, before, even if, even though, if, in order that, since, so that, though, unless, until, when, whenever, where, wherever, while.
3. Correlative Conjunctions: These are pairs of conjunctions that connect words, phrases, or clauses that are grammatically parallel. Examples include:
* Both...and
* Either...or
* Neither...nor
* Not only...but also
* Whether...or
So, there's no specific "3 conjunctions", but these three categories encompass the most common types of conjunctions in the English language.