Correlative conjunctions are paired words that work together to connect grammatically equivalent words, phrases, or clauses. Common pairs include either…or, neither…nor, both…and, not only…but also, whether…or, and just as…so. Correct usage depends on choosing the complete pair, maintaining parallel structure, and applying the right agreement rule.
Key Facts
Correlative conjunctions always function as pairs, such as both…and or neither…nor.
The elements joined by a correlative conjunction should match grammatically.
Either…or presents alternatives, while neither…nor rejects both alternatives.
Not only…but also adds emphasis to the second coordinated element.
With either…or and neither…nor, the verb usually agrees with the nearer subject.
Correlative conjunctions can join individual words, phrases, or independent clauses.
What Are Correlative Conjunctions?
Correlative conjunctions are paired conjunctions that connect two elements with the same grammatical function. The connected elements may be nouns, adjectives, verb phrases, prepositional phrases, or clauses, provided the sentence preserves a balanced structure.
For example, Maya bought both a notebook and a planner connects two noun phrases. The analyst will either revise the forecast or defend the original estimate connects two verb phrases. In both sentences, the paired conjunctions signal a relationship while the linked elements remain structurally comparable.
The word correlative means that the two conjunctions correspond with each other. The first word prepares the reader for the second, so combinations such as either…nor and neither…or are normally considered incorrect in standard English.
What Do Correlative Conjunctions Express?
Different pairs communicate different logical relationships. Some express addition, some express alternatives, and others express comparison or uncertainty.
| Correlative pair | Main relationship | Typical meaning | Example |
|---|---|---|---|
| both…and | Addition | Two elements are included | Both Omar and Lina attended |
| either…or | Alternative | One of two options | Choose either tea or coffee |
| neither…nor | Double negative | Both options are excluded | Neither rain nor snow stopped us |
| not only…but also | Emphatic addition | The second element receives emphasis | She is not only quick but also accurate |
| whether…or | Alternative possibility | An issue remains open or uncertain | Decide whether to stay or leave |
| just as…so | Comparison | One action parallels another | Just as plants need water, so animals need food |
The same pair can operate at different grammatical levels. Both the interns and the supervisor joins noun phrases, while both reviewing the contract and updating the database joins gerund phrases.
How Do Correlative Conjunctions Work?
Correlative conjunctions work by placing one conjunction before the first element and its matching conjunction before the second element. The pair creates a grammatical frame around the coordinated material.
Consider The service is both reliable and affordable. The first conjunction, both, introduces reliable; the second, and, introduces affordable. The conjunctions are separated because the words they connect occupy the space between them.
A reliable construction follows three stages:
- Identify the two elements. Decide exactly what the sentence needs to connect.
- Choose the logical relationship. Select addition, choice, rejection, emphasis, uncertainty, or comparison.
- Match the structures. Make the two connected elements the same grammatical type whenever possible.
The most useful test is to remove the conjunctions temporarily and compare the remaining elements. In The proposal is practical and affordable, both complements are adjectives. In The proposal is practical and reduces costs, the structures differ, even though the meaning may be understandable.
Where Should the Pair Be Placed?
Each conjunction should appear immediately before the element it introduces. This placement prevents ambiguity and makes the relationship easy to process.
- Either the finance team or the legal team will respond.
- The device is not only compact but also durable.
- We considered both the price and the warranty.
A sentence can sometimes place both later for natural emphasis: The device is compact and durable is simpler than The device is both compact and durable. Correlative conjunctions are useful when the writer wants to mark the relationship explicitly, especially when the alternatives or additions are long.
Main Correlative Conjunction Pairs
The six common pairs below differ in meaning, grammatical behavior, and register. Selecting the pair begins with identifying the relationship between the two connected ideas.
Both…and
Both…and joins two included elements and normally creates a plural subject when it connects two subjects. It is appropriate when the writer means that the two items apply together.
- Both the director and the producer approved the script.
- The course teaches both grammar and pronunciation.
- Both repairing the roof and replacing the wiring will increase the cost.
When both…and connects subjects, use a plural verb: Both the engine and the transmission require inspection, not requires inspection. The pair does not present a choice. It includes both elements.
Either…or
Either…or presents two alternatives. Depending on the context, the alternatives may be mutually exclusive, or the sentence may simply identify two available possibilities.
- You can either submit the form online or mail a paper copy.
- Either the technician or the supervisor will contact you.
- We will meet either on Tuesday or on Wednesday.
In formal editing, place either directly before the first alternative when possible. The sentence You can submit either the form online or mail a paper copy creates a mismatch because the form online is a noun phrase while mail a paper copy is a verb phrase. A parallel revision is You can either submit the form online or mail a paper copy.
Neither…nor
Neither…nor excludes both alternatives. Because neither already contributes negative meaning, adding not usually creates a nonstandard double negative in formal writing.
- Neither the estimate nor the invoice includes tax.
- The witness could neither identify the driver nor describe the vehicle.
- Neither option is suitable for children under five.
The construction is negative without not: Neither proposal meets the deadline means that proposal A does not meet it and proposal B does not meet it.
Not only…but also
Not only…but also adds two related facts while giving extra emphasis to the second element. It often appears in formal, persuasive, academic, and professional writing.
- The update not only improves security but also reduces loading time.
- She is not only an experienced editor but also a trained linguist.
- The policy affects not only employees but also contractors.
When not only begins an independent clause, formal English commonly uses subject-auxiliary inversion:
- Not only did the update improve security, but it also reduced loading time.
- Not only is the course affordable, but it is also flexible.
The inversion applies after the opening not only because the phrase has a fronted, restrictive-like position. It does not normally apply when not only appears within the ordinary subject-verb order.
Whether…or
Whether…or introduces alternatives under consideration, uncertainty, or a condition that does not change the result. It frequently appears in indirect questions.
- The committee must decide whether to approve the merger or delay it.
- Whether you agree or disagree, the deadline remains Friday.
- We do not know whether the package arrived by courier or by mail.
Whether…or and either…or overlap, but they are not interchangeable in every context. Either…or usually presents a direct choice: Choose either route or wait. Whether…or frames a question, uncertainty, or concession: Whether you choose the route or wait, call the office.
Just as…so
Just as…so creates a comparison between two actions, conditions, or principles. The pair is grammatically valid but more formal and less frequent in everyday speech than the other common pairs.
- Just as exercise strengthens the body, so practice strengthens memory.
- Just as the prototype failed under pressure, so the final model requires testing.
- Just as consumers compare prices, so businesses compare suppliers.
Writers should use just as…so when the parallel comparison is meaningful. In casual prose, just as exercise strengthens the body, practice strengthens memory may sound more natural.
How Does Parallel Structure Work?
Parallel structure means that correlative conjunctions connect equivalent grammatical forms. A noun should normally pair with a noun, an adjective with an adjective, a phrase with a phrase, and a clause with a clause.
| Incorrect construction | Structural problem | Parallel revision |
|---|---|---|
| She is not only kind but also helps students | Adjective plus verb phrase | She not only helps students but also mentors new teachers |
| The job requires either accuracy or working quickly | Noun plus gerund phrase | The job requires either accuracy or speed |
| He both studied the map and the route | Verb phrase plus noun phrase | He both studied the map and planned the route |
| The policy affects neither employees nor reducing costs | Noun plus gerund phrase | The policy affects neither employees nor contractors |
| They will decide whether to stay or a transfer | Verb plus noun phrase | They will decide whether to stay or transfer |
Parallelism concerns function, not merely word length. She is not only a talented designer but also an effective manager is parallel because both elements are noun phrases functioning as complements. She is not only talented but also an effective manager is less balanced because an adjective is paired with a noun phrase.
Can Clauses Be Parallel?
Yes. Correlative conjunctions can connect independent or dependent clauses when each clause has a comparable internal structure.
- Either the vendor will reduce the price, or we will select another supplier.
- The experiment not only produced unexpected results, but it also raised new questions.
- Whether the data are complete or whether the sample is too small, the conclusion requires caution.
Long clauses make parallelism harder to see. Repeat a helping verb, preposition, or subject when repetition clarifies the structure. Concision is useful only when it does not force the reader to reconstruct the grammar.
How Does Subject-Verb Agreement Work?
With either…or and neither…nor, the verb generally agrees with the subject closer to it. This rule matters when one subject is singular and the other is plural.
- Either the manager or the assistants are available.
- Either the assistants or the manager is available.
- Neither the teacher nor the students are attending.
- Neither the students nor the teacher is attending.
The nearer-subject rule is widely used in edited English, although some writers revise the sentence to avoid an awkward agreement choice. A clearer alternative is to place the plural subject nearest the verb or rewrite the sentence:
- Original: Neither the teacher nor the students are attending.
- Alternative: The teacher and the students are both absent.
- Alternative: Neither group is attending.
Both…and normally takes a plural verb because it joins two subjects:
- Both the budget and the timeline require revision.
- Both the printer and the scanner are offline.
With not only…but also, agreement depends on the actual subject and sentence structure. When the pair joins two subjects, apply the same proximity principle in formal usage:
- Not only the manager but also the assistants are attending.
- Not only the assistants but also the manager is attending.
Pronouns require case awareness. Use subject forms when the coordinated elements are subjects: Both she and I approved the plan. Use object forms after a verb or preposition: The manager contacted both him and me. In informal speech, both me and him is common in some positions, but edited writing generally uses the appropriate objective forms.
How to Use Correlative Conjunctions in a Sentence
Constructing a correct sentence takes less than a minute when the writer separates meaning, structure, and agreement.
Step 1: Identify the Elements
Underline the two items you want to connect. Suppose the intended elements are review the contract and ask for revisions. Both are verb phrases.
Step 2: Select the Pair
Use either…or if the reader must choose one action:
You should either review the contract or ask for revisions.
Use both…and if both actions are required:
You should both review the contract and ask for revisions.
Use not only…but also if the second action deserves emphasis:
You should not only review the contract but also ask for revisions.
Step 3: Insert the Pair
Place the first conjunction before the first element and the second before the second element. Do not place both conjunctions at the beginning or leave the second half implicit.
Step 4: Test Parallelism
Remove the pair and compare the elements:
- review the contract
- ask for revisions
Both are base-form verb phrases, so the structure is parallel.
Step 5: Check Meaning and Agreement
Confirm that the pair expresses the intended relationship. Then inspect the subject, especially when either…or, neither…nor, or not only…but also joins subjects.
Step 6: Read the Sentence Aloud
Listening often reveals a missing to, repeated noun, or misplaced conjunction. Oral rhythm is not a substitute for grammar, but an uneven rhythm frequently signals faulty coordination.
Correlative Conjunctions Compared with Other Conjunctions
Correlative conjunctions differ from coordinating and subordinating conjunctions mainly in form and sentence relationship. Coordinating conjunctions are single words, while correlative conjunctions operate as paired units.
| Conjunction category | Common examples | Number of words | Relationship | Example |
|---|---|---|---|---|
| Correlative | either…or | 2 paired terms | Alternative | Either call now or email later |
| Coordinating | and, but, or | 1 | Equal elements | Call now or email later |
| Subordinating | although, because, if | 1 | Dependent relationship | Call because the office closes |
| Conjunctive adverb | however, therefore | 1 adverb | Sentence-level connection | The office closes; therefore, call now |
A coordinating conjunction can often replace a correlative pair, but the emphasis may change. The service is reliable and affordable is neutral. The service is both reliable and affordable explicitly presents the two qualities as a coordinated set.
Subordinating conjunctions do not create parallel coordination in the same way. Because the shipment was late, production stopped makes one clause dependent on another, whereas either the shipment arrives today or production stops presents two alternatives.
When Should You Use a Correlative Pair Instead of a Single Conjunction?
Use a correlative pair when the relationship needs emphasis, contrast, explicit alternatives, or balanced presentation. Use a single coordinating conjunction when the relationship is simple and the extra framing would make the sentence heavier.
| Writing situation | Recommended form | Reason |
|---|---|---|
| Simple addition | and | Shortest clear option |
| Two required items | both…and | Emphasizes inclusion |
| Direct choice | either…or | Marks alternatives |
| Formal double rejection | neither…nor | Excludes both items |
| Persuasive emphasis | not only…but also | Highlights the second point |
| Open question | whether…or | Expresses uncertainty or condition |
Common Errors and How to Fix Them
Mixing Pair Members
Do not combine the first half of one pair with the second half of another.
- Incorrect: Neither the manager or the CEO approved it.
- Correct: Neither the manager nor the CEO approved it.
- Incorrect: Either the printer nor the scanner works.
- Correct: Either the printer or the scanner works.
A proofreading table can prevent this error:
| First member | Required second member | Incorrect substitute |
|---|---|---|
| both | and | or |
| either | or | nor |
| neither | nor | or |
| not only | but also | and |
| whether | or | and |
| just as | so | but |
Creating Faulty Parallelism
Faulty parallelism occurs when the two coordinated elements use different grammatical forms without a deliberate reason.
- Incorrect: He is not only good at mathematics but also loves science.
- Correct: He is not only good at mathematics but also enthusiastic about science.
- Better when emphasizing actions: He not only excels at mathematics but also studies science.
The second revision changes the shared structure from adjective phrases to verb phrases. That kind of restructuring usually produces the cleanest correction.
Misplacing the First Conjunction
The first conjunction should introduce the first item in the coordinated relationship.
- Less clear: She will either take the train or drive.
- Clearer: She will either take the train or drive the car.
The first sentence is grammatically acceptable because take the train and drive are both verb phrases. The second sentence gives the final action an explicit object, which may help when several transportation choices are possible.
Using a Double Negative
Neither…nor already makes both elements negative.
- Nonstandard in formal writing: She did not buy neither bread nor milk.
- Standard: She bought neither bread nor milk.
- Standard alternative: She did not buy either bread or milk.
The alternative using not…either…or is especially useful when the sentence already contains another negative structure.
Omitting “Also” for Emphasis
In many sentences, not only…but also requires the second member to be recognizable. Omitting also can weaken the expected pair, although ordinary usage sometimes permits not only…but.
- More balanced: The training is not only practical but also affordable.
- Less emphatic: The training is not only practical but affordable.
In polished academic and business prose, retaining also makes the pairing more visible and reduces processing effort.
Punctuation and Style Rules
Correlative conjunctions do not automatically require a comma. A comma is usually unnecessary when the pair connects words or short phrases.
- The plan is both practical and affordable.
- You may either call or write.
When the pair connects two independent clauses, punctuation depends on clause length and the conjunction. A comma commonly appears before or or but also when each side contains a complete clause:
- Either the supplier will refund the payment, or the bank will reverse the charge.
- Not only did the test fail, but it also damaged the equipment.
A semicolon may be appropriate when the clauses are long or contain internal commas:
- Either the supplier will refund the payment by Friday, when the audit begins; or the bank will reverse the charge.
Many style guides would instead recommend rewriting that sentence because the paired structure is cumbersome. Correlative conjunctions are not inherently more sophisticated than simple conjunctions. They are effective when they make the logical relationship clearer.
Special Cases and Expert Usage Decisions
Correlative Pairs with Long Elements
Long coordinated elements should begin at comparable grammatical points. Repeating a preposition can improve clarity:
- The grant supports research both in rural clinics and in public laboratories.
Some writers place both before the first prepositional phrase, while others place it before the verb phrase. The best position is the one that makes the scope unmistakable.
Ellipsis and Repeated Words
English often omits repeated material after the second conjunction:
- The company will either expand in Canada or in Mexico.
- The company will expand either in Canada or Mexico.
Both are widely understood. Repeating in can improve parallelism when the alternatives are long or when the sentence will be read quickly.
Formal Inversion with Not Only
Opening not only can produce inversion:
- Not only did the report identify the error, but it also explained the cause.
- Not only was the software unstable, but it was also difficult to update.
Do not write Not only the report did identify the error. The auxiliary verb must precede the subject in the inverted clause: Not only did the report identify…
Agreement When Subjects Contain Modifiers
Ignore intervening phrases when identifying the subject:
- Either the manager of the regional offices or the assistants are responsible.
The nearest grammatical subject is assistants, not offices. A useful practitioner rule is to temporarily remove prepositional phrases: Either manager or assistants are responsible. The remaining structure makes agreement easier to see.
When Not to Use Them
Correlative conjunctions are not ideal for every sentence. They can make short statements sound ceremonial, create agreement problems, or force artificial symmetry when the two ideas are genuinely different.
- Heavy: The policy not only affects the staff but also has implications for vendors.
- Cleaner: The policy affects the staff and has implications for vendors.
- Parallel emphasis: The policy affects not only the staff but also the vendors.
The first version coordinates a verb phrase with a full clause. The final version coordinates two noun phrases and is therefore easier to process.
How Long Does It Take to Master Correlative Conjunctions?
Most learners can recognize the six common pairs in 10-15 minutes, write basic both…and and either…or sentences within 1-2 days, and gain reliable control of parallelism and agreement after 2-4 weeks of deliberate editing practice.
A practical study sequence is:
- First session: Memorize the pair members and meanings.
- First week: Write five examples for each of the most common pairs.
- Second week: Correct faulty parallelism and subject-verb agreement.
- Third and fourth weeks: Edit real academic, workplace, or exam sentences.
Mastery does not mean using every pair frequently. It means choosing a pair only when its logical relationship improves the sentence.
Advantages and Limitations
Correlative conjunctions give readers an explicit map of the relationship between two ideas. They can make alternatives easier to identify, emphasize a second point, and create deliberate balance in speeches, reports, and essays.
Their limitations are structural. They increase the number of words, can make prose formal, and create errors when writers coordinate unlike grammatical forms. Not only…but also is particularly easy to overuse in promotional writing, where repeated emphasis can make every feature appear equally important.
A useful editing rule is to keep a correlative pair when removing it changes the meaning or emphasis. Replace it with a single conjunction when the pair adds no useful distinction.
FAQ
Are correlative conjunctions always two words?
Correlative conjunctions are paired expressions, but each pair may contain more than two written words. Not only…but also contains four words, while either…or contains two conjunction terms. The defining feature is correspondence between the members, not a fixed total word count.
What is the easiest correlative conjunction pair to learn?
Both…and is usually the easiest pair because it expresses straightforward addition and normally takes a plural subject. Start with sentences such as Both the teacher and the student signed the form, then practice alternatives with either…or and negative alternatives with neither…nor.
Can correlative conjunctions join two sentences?
Yes. Correlative conjunctions can join two independent clauses when the clauses are parallel and the punctuation is correct. For example, Either the shipment will arrive today, or the company will issue a refund contains two complete clauses connected as alternatives.
Do correlative conjunctions need commas?
Correlative conjunctions do not automatically require commas. Do not normally use a comma when the pair joins words or short phrases, as in both coffee and tea. A comma may separate two independent clauses, particularly when each clause has its own subject and verb.
Is “both” a conjunction by itself?
Both is not normally a complete conjunction by itself in the correlative pattern. It functions with and to create both…and, although both can also work as a pronoun, determiner, or predeterminer in other grammatical contexts, such as Both answers are correct.
Which verb follows “either…or”?
With either…or, the verb generally agrees with the subject closest to it. Write Either the manager or the assistants are available, but Either the assistants or the manager is available. When the result sounds awkward, rewrite the sentence to avoid mixed agreement.
The Bottom Line
Correlative conjunctions are paired expressions that connect equal grammatical elements and communicate addition, alternatives, rejection, emphasis, uncertainty, or comparison. The essential rules are simple: use the correct pair, place each member before its element, preserve parallel structure, and check agreement with the nearest subject when the pair joins subjects. Used selectively, correlative conjunctions make relationships between ideas precise without making prose unnecessarily heavy.
