The English words either and neither can cause some problems for native and non-native speakers of English. Sometimes you can use either one and sometimes you have to choose either one or the other, but neither one is very difficult.
Either... or is used to offer a choice between two possibilities:
Either can also be followed by (one) of + group of two:
Not… either… or denies both possibilities:
Not… either is used after a negative statement.
Neither… nor is equivalent to not… either… or.
Neither can also be followed by (one) of + group of two:
Neither is used like not… either.
The Bottom Line
Either means one, neither means none, and not either equals neither. Or goes with either and nor goes with neither.
More English Difficulties