Both / Either / Neither Parties
Both ... and
The paired conjunction 'both ... and' is used to introduce dual subjects which take plural verb conjugations.
Both the pin pad and the website technology are cutting edge with that bank.
Both the banks and the grocery store use ATM pin pads for convenience.
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.
I need either your pin number or your signature verification.
Either Tom or the investors will be responsible for outstanding credits.
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 conservative spending nor budget reforms will save this company.
The budget neither agreed with your estimate nor mine.
Neither the client nor the company were able to reach an agreement.
Neither management nor labor is willing to reach an agreement.