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Some conjunctions hunt in pairs. A plain coordinator like and sits between two items; a subordinator such as because tucks one clause inside another. Correlative conjunctions do something different—they team up across a sentence to balance two equal parts, giving the whole line a crisp, paired-up rhythm. The big five are both...and, either...or, neither...nor, not only...but also, and whether...or. The sections below walk through each duo, pin down the two rules that trip people up most (parallel structure and subject–verb agreement), and finish with short drills you can run in a minute.
Table of Contents
The Basic Idea
A correlative conjunction is a two-part connector whose halves always appear together. The label comes from the same root as correlation—two things linked to each other. Each half sits directly in front of the element it introduces, so the reader sees the match up front.
"Both the volunteers and the coordinators stayed until midnight."
"Either we submit the proposal today or we lose the contract."
The Core Five at a Glance
| Pair | What it signals | Sample sentence |
|---|---|---|
| both...and | Adding two items together | "Both coffee and tea are served at breakfast." |
| either...or | Picking one of two options | "Either take the bus or call a cab." |
| neither...nor | Ruling out both options | "Neither the heater nor the fan was working." |
| not only...but also | Stacking on a surprising extra | "She is not only patient but also funny." |
| whether...or | Weighing two possibilities | "Whether the game is played indoors or outside, bring a jacket." |
Both...And
This pair says that both items apply—equally and at the same time. It adds a gentle note of completeness, underlining that neither half can be left out.
"My neighbour speaks both Tagalog and Mandarin."
"Both the architect and the client signed off on the plans."
"The café is both quiet and wonderfully warm in winter."
"My uncle both paints and restores old furniture."
Subject-verb agreement: Two subjects joined by "both...and" act as a plural: "Both Priya and Marcus are running the workshop" (not "is running").
Either...Or
"Either...or" sets up a choice between two candidates—two nouns, two actions, two phrases, or two full clauses.
"Either you finish the report tonight or I'll have to present without it."
"For dessert you can order either the sorbet or the cheesecake."
"The ceremony will be held either in the garden or under the marquee."
"Either the red tie or the striped one goes with that suit."
Subject-verb agreement: When two subjects are joined by "either...or," the verb matches whichever subject sits closer to it: "Either the interns or the team lead is going." / "Either the team lead or the interns are going."
Neither...Nor
"Neither...nor" is the negative twin of "either...or." It rules out both options in one move—nothing on either side of the pair applies.
"Neither the documentary nor the novel captured the real story."
"He neither apologised nor explained himself."
"Neither fatigue nor bad weather slowed the hikers down."
"The soup was neither salty nor spicy enough for my taste."
Subject-verb agreement: The "nearest subject" rule applies here too: "Neither the boys nor their sister is home." / "Neither their sister nor the boys are home."
Not Only...But Also
This pair piles a second point on top of a first, often with a tone of and there's more. The second item is framed as extra, sometimes unexpected, information.
"He is not only an engineer but also a published poet."
"Rosa not only won the semifinal but also broke the school record."
"Not only did the film surprise the critics, but it also outsold the sequel."
"The apartment is not only spacious but also close to two metro stations."
Note: Opening a sentence with "not only" triggers inversion in the first clause—auxiliary before subject: "Not only does he compose music, but he also conducts the orchestra."
Subject-verb agreement: The verb follows the nearer subject, which in most real sentences is the one after "but also": "Not only the editors but also the publisher was caught off guard."
Whether...Or
"Whether...or" lays out two possibilities, typically where either outcome leads to the same result or both sides of a decision are being weighed:
"Whether you approve or object, the vote has already passed."
"We're heading out whether the forecast says sun or storms."
"The board must decide whether to expand locally or to open an overseas office."
"Whether the pitch lands or flops, she'll learn something from it."
Lesser-Known Duos
Beyond the five headliners, English has a handful of smaller correlative teams:
- as...as: "This summer is as dry as last year's."
- just as...so: "Just as the forecasters warned, so the river rose."
- the more...the more: "The more I read his essays, the more I disagree with him."
- no sooner...than: "No sooner had the guests sat down than the lights went out."
- not...but: "Our goal is not speed but accuracy."
- rather...than: "She would rather listen than argue."
- scarcely...when: "Scarcely had the kettle boiled when someone knocked at the door."
Keeping the Two Sides Parallel
If one rule carries most of the weight, it's parallel structure: whatever kind of phrase follows the first half of the pair must follow the second. Noun with noun, verb with verb, prepositional phrase with prepositional phrase. Once the two sides line up, the sentence reads cleanly.
✗ Not parallel: "He both enjoys cooking and is good at it." (verb phrase + linking clause)
✓ Parallel: "He both enjoys and excels at cooking." (verb + verb)
✗ Not parallel: "Not only is the novel gripping but also beautifully written." (clause + participle phrase)
✓ Parallel: "The novel is not only gripping but also beautifully written." (adjective + adjective phrase)
✗ Not parallel: "Either we can drive up to the cabin or the lake." (clause + noun)
✓ Parallel: "We can drive either to the cabin or to the lake." (prep phrase + prep phrase)
Placement Tip: To check parallelism at a glance, drop each half of the pair immediately before the element it introduces. "Both" in front of a noun pairs with "and" in front of a noun; "either" before a verb pairs with "or" before a verb. If the two slots don't match part-of-speech, the sentence isn't parallel yet.
Matching the Verb to the Subject
| Correlative Pair | Agreement Rule | Example |
|---|---|---|
| both...and | Always plural | "Both she and her cousin are lawyers." |
| either...or | Match the nearer subject | "Either I or my parents are attending." |
| neither...nor | Match the nearer subject | "Neither my parents nor I am attending." |
| not only...but also | Match the nearer subject | "Not only Ben but also his sisters are invited." |
Mistakes People Make
1. Swapping the Wrong Partner In
✗ "Neither Ana or Luis remembered the code." (Wrong: "or" where "nor" belongs)
✓ "Neither Ana nor Luis remembered the code."
2. Breaking Parallelism
✗ "She not only paints landscapes but also is a photographer."
✓ "She is not only a landscape painter but also a photographer."
3. Picking the Wrong Verb Form
✗ "Both the pitcher and the catcher is practising today."
✓ "Both the pitcher and the catcher are practising today."
Quick Practice
Fill in each blank with the matching correlative pair:
- "___ the guests ___ the hosts enjoyed the evening."
- "She ___ writes lyrics ___ produces her own tracks."
- "___ send the form today ___ we'll miss the deadline."
- "He was ___ nervous ___ excited before the speech."
- "___ had the judge walked in ___ the crowd went silent."
Answers: 1. Both...and. 2. not only...but also. 3. Either...or. 4. both...and. 5. No sooner...than.
Key Takeaway: Correlative conjunctions run in fixed pairs that join balanced pieces of a sentence. Keep the grammar on each side symmetrical, and remember the agreement rules: "both...and" triggers a plural verb, while "either...or" and "neither...nor" take the verb that matches the nearer subject.