Either and Neither

either:

1. the one and the other (each / both)

Example: Flowers on either side of the street.

2. the one or the other

Example: Use either hand it does not matter

either / or:

1. indicates two (or more) equal alternatives

Example: A bag used

either to carry books or to carry groceries.

2. indicates two (or more) mutually exclusive alternatives

Example: I want to play either soccer or basketball.

neither

1. not the one and not the other of two

Example: Neither of us wants to go to the beach

neither / nor

1. Indicates that the following alternatives are rejected

Example: Neither you nor I use bad words

2. indicates a negative in the preceding clause.

Example: Mary doesn't want chocolates or cookies, so I don't want chocolate and cookies neither.

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* "me neither" literally means "me not also"

* either and can are used to emphasize a negative

Example: This is the best restaurant in town and it's not expensive either.