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.
How to Use EITHER
1. Either can also be followed by (one) of + group of two:
- Either of us could do it.
- Either one of us could do it.
- Either of you should know.
- Either one of you should know.
2. Either... or
Either... or is used to offer a choice between two possibilities:
- Either John or Sophia will be there.
- We should bring either tea or coffee.
3. Not… either… or denies both possibilities:
- I don’t think either John or Sophia will be there.
4. Not… either is used after a negative statement.
- I don’t speak English. You don’t either.
How to Use NEITHER
1. Neither can also be followed by (one) of + group of two:
- Neither of them is ready.
- Neither one of them is ready.
- Neither of us has any money.
- Neither one of us has any money.
Neither… nor is equivalent to not… either… or.
- Neither John nor Sophia will be there.
- We brought neither tea nor coffee.
3. Neither is used like not… either.
- I don’t speak English. Neither do I - (informal): Me neither.