If you have, don’t worry, you are not the only one. Even native speakers will sometimes get things like this confused! When you learn English, it helps to know little grammar tricks that help you tell the difference between words like these.
Either and neither can be used in several ways: adverbs, determiners, pronouns, and conjunctions.
While ‘either’ has a positive connotation, ‘neither’ holds a negative significance. You will always find them paired up this way: either/or and neither/nor. These are the ways you can find them being used. See More . . .