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Coordinators connect equal parts of speech. They are known as conjunctions.

 Coordinators connect equal units of grammar. For example, and and or can connect nouns to nouns, finite verbs to finite verbs, adjectival phrases to adjectival phrases, or one independent clause to another independent clause. Coordinators NEVER connect two different or unequal units of grammar. This rule is known as parallel structure.


 Coordinators differ in their meaning, one from another, because some suggest similarity, while other suggest dissimilarity. 


Other coordinators connect only independent clauses. These include but, so, and yet. Because but and yet are contrastive, they are sometimes called disjuncts. 






The cat and the dog were constantly fighting.
The cat slept and ate
Mary went to the movies, and so did Sam


or (used with either). 

nor (used with neither.)

Either the cat or the dog has fleas.
The cat neither eats nor plays.
We will  go to either to the movies or to the play.
The cat slept,  but the dog played.
I wanted to sleep, but the noise kept me awake.  
Mary went to the movies, but Sam went to the theatre.
I worked hard, yet I was not tired.
The cat slept late, yet she did not want to eat when she awoke.
I wanted to go to the movies, yet I went to the theatre, instead..
Juan helped Paulo to finish cleaning, so they finished on time.
I had eaten breakfast, so I wasn't hungry during class.
I forgot my wallet, so I needed to borrow money for bus fare. .