There are coordinating conjunctions that work alone:
And there are correlative conjunctions that work in pairs:
either ... or
neither ... nor
both ... and
not only ... but also
Either kind of conjunctions can join together all kinds of sentence parts.
Madison and Mariah raise rabbits.
The girls are busy but responsible.
They clean the cages and groom the rabbits for a 4-H show.
They work quickly and carefully.
Compound direct object:
They need a ride to the exhibit hall. Madison will ask her mother or her father.
Compound object of a preposition:
After the demonstration and the judging the girls decide it is time to go home.
Compound indirect object:
Mariah will give either her mother or her father a call to ask for a ride.
Either kind of conjunctions can join together independent sentences. Notice that the comma in front of the conjunction is required when you are joining two complete !
Either the girls will continue to work with rabbits, or they will decide to do a different project next year.
Mariah loves taking care of her rabbits, so she will probably choose to do them again.
Madison wants to raise horses, but she doesn't have enough money to do that.
Madison would like to continue to work with Mariah, for they are best friends.
Not only do the girls want to continue to work together, but they also want to continue in their same 4-H club.
The other girls in the club want to continue next year, too, yet they will need to find a new leader.