Neither ... nor

Neither / nor is 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.

Note the following rules:

1. If both elements are singular, then the verb 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.

• Neither the teacher nor the students were in the classroom this morning. (the students is plural; so the verb were is plural too) 

Source: http://www.myenglishpages.com/site_php_files/grammar-lesson-either-or-neither-nor.php