Both / Either / Neither Parties
Both ... and
The paired conjunction 'both ... and' is used to introduce dual subjects which take plural verb conjugations.
Both Terence and Noam wanted to help needy people.
Both building and operating the project required extending our timetable.
Either ... or
The paired conjunction 'either ... or' is used in sentences to show that one or the other is performing an action. Conjugate verbs based on the subject (singular or plural) closer to the conjugated verb.
Either Douglas or Adam will oversee the negotiation.
Either Lloyd's of London or AIG will do the underwriting on this loan.
Neither ... nor
The paired conjunction 'neither ... nor' is used in sentences giving a negative sense. Neither one nor the other subject does an action. The negative is conveyed by the 'n' in 'neither' and 'nor'. 'Not' is not placed before the verb. Conjugate verbs based on the subject (singular or plural) closer to the conjugated verb.
Neither the customer nor the owner knew which vehicle would be used.
Neither George nor Barry's friends are going to work in the nonprofit sector.
Neither the designer nor the website managers could guarantee the viral marketing campaign would succeed.
Neither Daniel nor the other speakers at Burning Man reached the ultimate objective.