1.Either / or - used in a sentence in the affirmative sense when referring to a choice between two possibilitiesWe 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
Neither my mother nor my father went to university.
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 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)