English Grammar : article, syntax, verbs conjugation, English spelling

Either, neither, both

The words either, neither, and both are all used to talk about how two objects
relate to each other. “Either” means “X OR Y” (but not both):

“Was either of the drivers hurt in the accident?”
Either John OR Carol can do the job.”

“Neither” means “NOT X and NOT (NOR) Y.” Although people often use “or” with
“neither,” it is more grammatically correct to use “nor”:

Neither Frank nor John came to the party.”
Neither of the music stores has the CD.”

“Both” means “X and Y”:

“I've got holes in both of my shoes!”
Both the front tire and the back tire are flat.”