Grammar

Either / or versus Neither / nor

1- Either / or
used in a sentence in the affirmative sense
when referring to a choice between two possibilities
Ex: We can either eat now or after the show - it's up to you.

2- Neither / nor
used in a sentence in the negative sense
when you want to say that two or more things are not true
Ex: Neither my mother nor my father went to university.

Singular or plural
When using either/or and neither/nor, note the following rules:

1. If both elements are singular, then the verb is singular too.
Either the father or the mother has to attend the meeting.
(father and mother are singular; so the verb has is singular too)
Neither Leila nor Nancy is going to write the report.
(Leila and Nancy are singular; so the verb is singular too)

2. However, if one of the elements is plural, then use a plural verb.
Either Sue or the girls are going to prepare dinner tonight.(the girls is plural; so the verb are is plural too)
Neither the teacher nor the students were in the classroom this morning.
(the students is plural; so the verb were is plural too)

NOTE: Either and neither can also come at the beginning of a sentence.

Examples:
Either we will go out, or we will stay at home.
Neither of the restaurants is open today.