Subject-verb agreement with long subjects and ‘either/neither… or’

• You must always make the verb agree with the head noun in the subject, even when they are separated by a clause and/or other elements in the subject noun phrase:

Details from the survey that was conducted during the study were revealed last month. 

• You should make the verb agree with the closest noun when using either/neither … or: 

Neither money nor possessions provide long-lasting happiness. 

Neither possessions nor money provides long-lasting happiness.