Either/or and neither/nor
1.Either / or – used in a sentence in the affirmative sense when referring to a choice between two possibilities
-Example :
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
-Example :
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 motherare 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 wereis plural too)