"Both... and" joins two elements POSITIVELY (both of them); "neither... nor" joins two elements NEGATIVELY (neither of them). They are opposites in meaning.
BOTH... AND: AFFIRMATIVE correlative conjunction. Joins TWO elements and indicates BOTH are valid, true, or relevant. "She is both intelligent and hardworking" = both qualities apply. "Both the manager and the director approved the plan." Verb agreement: when BOTH... AND joins two subjects, the verb is PLURAL: "Both the CEO and the CFO were present." Also functions as a quantifier: "I like both options" = I like either/each of the two.
The new leadership structure is both more efficient and more transparent than the previous model — the entire team has responded positively.
Both the technical documentation and the user guide need to be updated before the product goes to market next quarter.
She managed to deliver both the client presentation and the internal report by the end of Friday — an impressive output for a single week.
NEITHER... NOR: NEGATIVE correlative conjunction. Joins TWO elements and indicates NEITHER of them is valid, true, or relevant. "She is neither intelligent nor hardworking" = not intelligent AND not hardworking (neither quality applies). "Neither the manager nor the director approved the plan." Verb agreement with NEITHER... NOR: the verb agrees with the NEAREST noun (proximity rule): "Neither the CEO nor the employees were informed." (employees -> were). "Neither the employees nor the CEO was informed." (CEO -> was).
Neither the engineering team nor the product team was consulted during the decision-making process — a significant oversight.
The proposal was rejected because it was neither financially viable nor aligned with the company's long-term strategic direction.
She has neither the budget nor the headcount to take on additional projects this quarter — the team is already at full capacity.
Common mistake
Three most common errors: (1) "Neither... or" = INCORRECT. With NEITHER, the second conjunction is always NOR (not "or"): "NEITHER... NOR." (2) "Both... or" = INCORRECT. With BOTH, the second conjunction is always AND: "BOTH... AND." (3) Incorrect verb agreement with NEITHER... NOR. "Neither the manager nor the employees was present" = INCORRECT if the nearest noun is plural ("employees"). Proximity rule: the verb agrees with the NEAREST noun. "Neither the manager NOR THE EMPLOYEES [nearest] WERE present."
Trick to remember it
FIXED PAIRS: BOTH always goes with AND. NEITHER always goes with NOR. These are the only correct combinations — there is no BOTH... OR or NEITHER... OR. For verb agreement with NEITHER... NOR: look at the noun CLOSEST to the verb (the one that appears after NOR). "Neither John NOR HIS COLLEAGUES [closest, plural] ARE here." "Neither his COLLEAGUES NOR JOHN [closest, singular] IS here." This proximity rule is more important in formal English; in informal speech, many natives use plural with NEITHER... NOR regardless of order.
Quick rule
Both... and = both of them (positive). Neither... nor = neither of them (negative). Both + AND. Neither + NOR. With neither... nor, the verb agrees with the noun closest to the verb (proximity rule).
Did you know?
BOTH... AND and NEITHER... NOR are part of what are called "correlative conjunctions" in English — pairs of words that work together to connect elements of the same category. English has several correlative pairs: EITHER... OR (one or the other), NEITHER... NOR (neither), BOTH... AND (both), NOT ONLY... BUT ALSO, WHETHER... OR. These conjunctions have roots in Proto-Germanic and function similarly in German (sowohl... als auch = both... and) and Dutch. Their common characteristic is that they always connect PARALLEL elements: two nouns, two verbs, two clauses — the structure must be symmetrical.
Exercise 1 · Pick the right one
The new policy affects _____ full-time employees _____ contractors — everyone working on-site will need to complete the security training.
Exercise 2 · Pick the right one
_____ the initial prototype _____ the revised version met the client's quality standards — a complete redesign was required.
Exercise 3 · Form the word
Both... and = both of them (positive). Neither... nor = neither of them (negative). Both + AND. Neither + NOR. With neither... nor, the verb agrees with the noun closest to the verb (proximity rule).
Three most common errors: (1) "Neither... or" = INCORRECT. With NEITHER, the second conjunction is always NOR (not "or"): "NEITHER... NOR." (2) "Both... or" = INCORRECT. With BOTH, the second conjunction is always AND: "BOTH... AND." (3) Incorrect verb agreement with NEITHER... NOR. "Neither the manager nor the employees was present" = INCORRECT if the nearest noun is plural ("employees"). Proximity rule: the verb agrees with the NEAREST noun. "Neither the manager NOR THE EMPLOYEES [nearest] WERE present."
FIXED PAIRS: BOTH always goes with AND. NEITHER always goes with NOR. These are the only correct combinations — there is no BOTH... OR or NEITHER... OR. For verb agreement with NEITHER... NOR: look at the noun CLOSEST to the verb (the one that appears after NOR). "Neither John NOR HIS COLLEAGUES [closest, plural] ARE here." "Neither his COLLEAGUES NOR JOHN [closest, singular] IS here." This proximity rule is more important in formal English; in informal speech, many natives use plural with NEITHER... NOR regardless of order.
Bryan López
Founder of SpeakUP Academy