A conjunction is a part of speech that connects words, phrases, or clauses and expresses the relationship between them. Conjunction usage shows whether ideas are joined by addition, contrast, choice, cause, time, condition, or another connection; the three main categories are coordinating, subordinating, and correlative conjunctions.
Key Facts at a Glance
- Coordinating conjunctions join grammatically equal elements, including two independent clauses.
- The seven coordinating conjunctions are for, and, nor, but, or, yet, and so, remembered as FANBOYS.
- Subordinating conjunctions introduce dependent clauses and establish relationships such as time, cause, condition, or concession.
- Correlative conjunctions occur in pairs, including either/or, neither/nor, and both/and.
- A comma normally precedes a coordinating conjunction only when it joins two independent clauses.
- However, therefore, and meanwhile are conjunctive adverbs, not coordinating conjunctions, and they require different punctuation.
What Is a Conjunction?
A conjunction connects grammatical units and tells readers how those units relate. In “Maya and Luis arrived,” and joins two nouns; in “Maya arrived early and waited outside,” it joins two verb phrases; in “Maya arrived early because traffic was heavy,” because connects an independent clause to a dependent clause.
Conjunctions reduce repetition and make relationships explicit. Without a conjunction, a writer might produce “The road was icy. The driver reduced speed.” With so, the relationship becomes causal: “The road was icy, so the driver reduced speed.”
A conjunction does not merely place words beside each other. Its choice affects meaning, emphasis, clause hierarchy, and punctuation. Although presents a concession, because presents a reason, and unless introduces a condition that must be avoided.
How does a conjunction connect sentence elements?
A conjunction connects elements that may be equal or unequal in grammatical status. Coordinating conjunctions link equal units, while subordinating conjunctions make one clause dependent on another.
| Connected elements | Example | Conjunction function |
|---|---|---|
| Two nouns | “Tea and coffee are available.” | Joins equal nouns |
| Two phrases | “She spoke with patience and precision.” | Joins equal prepositional phrases |
| Two independent clauses | “The alarm rang, but nobody moved.” | Joins complete thoughts |
| Dependent and independent clauses | “When the alarm rang, everyone left.” | Establishes time and hierarchy |
| Paired alternatives | “Either call today or send an email.” | Presents coordinated choices |
What Are the Main Types of Conjunctions?
The three traditional types are coordinating, subordinating, and correlative conjunctions. Coordinating conjunctions join equal elements, subordinating conjunctions introduce dependent clauses, and correlative conjunctions operate as matched pairs.
| Type | Grammatical job | Common examples | Typical relationship |
|---|---|---|---|
| Coordinating | Joins equal elements | and, but, or, so | Addition, contrast, choice, result |
| Subordinating | Introduces a dependent clause | because, although, if, when | Cause, concession, condition, time |
| Correlative | Joins equal elements in pairs | either/or, both/and | Choice, inclusion, alternatives |
| Conjunctive adverb | Links ideas rhetorically | however, therefore, meanwhile | Contrast, result, sequence |
The last row requires an important distinction. Conjunctive adverbs connect ideas in meaning, but they are adverbs rather than conjunctions. A writer cannot punctuate them exactly like and, but, or because.
How do coordinating conjunctions work?
Coordinating conjunctions join words, phrases, or clauses of equal grammatical rank. FANBOYS is a memory aid for for, and, nor, but, or, yet, so, although the words do not all express the same relationship.
| FANBOYS word | Main meaning | Correct example |
|---|---|---|
| for | Reason or explanation | “We left early, for darkness was approaching.” |
| and | Addition | “The report includes charts and recommendations.” |
| nor | Negative alternative | “She did not call, nor did she send a message.” |
| but | Contrast | “The route is longer, but it is safer.” |
| or | Choice or alternative | “Submit the form online or mail a paper copy.” |
| yet | Unexpected contrast | “The task was difficult, yet the team finished.” |
| so | Result | “The battery was low, so I charged the phone.” |
The comma rule depends on clause structure, not on the mere presence of a FANBOYS word. Use a comma when the conjunction joins two independent clauses: “The store closed, so we returned tomorrow.” Omit the comma when the second element is only a phrase: “The store closed so early.”
For is relatively formal and often sounds literary. So commonly expresses result in everyday writing, while yet usually creates sharper contrast than but.
How do subordinating conjunctions work?
Subordinating conjunctions introduce dependent clauses, which contain a subject and verb but cannot normally function as complete sentences. The subordinating conjunction identifies the relationship between the dependent clause and an independent clause.
| Relationship | Subordinating conjunctions | Example |
|---|---|---|
| Cause | because, since, as | “Because the server failed, the page became unavailable.” |
| Time | when, while, before, after, until | “After the meeting ended, staff updated the schedule.” |
| Condition | if, unless, provided that | “Unless rain returns, the event will continue.” |
| Concession | although, though, even though | “Although the price increased, demand remained stable.” |
| Comparison or contrast | whereas, while | “The north office is quiet, whereas the central office is busy.” |
A dependent clause may come first or second. When it comes first, place a comma after it: “Although the evidence was limited, the committee approved the pilot.” When it follows the independent clause, a comma is usually unnecessary: “The committee approved the pilot although the evidence was limited.”
Meaning can change when a writer substitutes one subordinator for another. Because gives a direct reason, since may indicate either time or cause, and as can be ambiguous because it also introduces comparisons and manner.
How do correlative conjunctions work?
Correlative conjunctions are paired expressions that join grammatically equal elements. The material after the first word must match the material after the second in form and function.
| Correlative pair | Correct pattern | Example |
|---|---|---|
| both/and | noun + noun | “The course covers both syntax and punctuation.” |
| either/or | verb phrase + verb phrase | “You can either revise the draft or replace the paragraph.” |
| neither/nor | noun + noun | “Neither the editor nor the author noticed the error.” |
| not only/but also | adjective phrase + adjective phrase | “The explanation is not only clear but also accurate.” |
| whether/or | clause + clause | “We must decide whether to delay the launch or proceed.” |
Faulty parallelism occurs when the paired elements have different forms: “The student likes both to read and writing.” Correct versions are “The student likes both to read and to write” and “The student likes both reading and writing.”
With either/or and neither/nor, verb agreement can become difficult. In formal edited English, the verb generally agrees with the nearer subject: “Neither the assistants nor the manager is available,” but “Neither the manager nor the assistants are available.” Rewriting avoids awkwardness when the subjects differ in number.
How Do You Choose the Right Conjunction?
Choose a conjunction by identifying the precise logical relationship first, then checking whether the connected elements are words, phrases, or clauses. A reliable selection process takes five steps.
- Separate the ideas. Write the underlying statements independently: “The forecast predicted snow” and “the roads remained open.”
- Name the relationship. The ideas may show contrast, cause, result, time, condition, addition, or choice.
- Select the grammatical category. Use a coordinator for equal clauses, a subordinator for dependence, or a correlative pair for matched alternatives.
- Check the clause boundary. Determine whether each side can stand alone as a complete sentence.
- Apply punctuation and parallelism rules. Add a comma, semicolon, or no punctuation according to the construction.
For the example, the relationship is contrast: “The forecast predicted snow, but the roads remained open.” A subordinating version changes emphasis: “Although the forecast predicted snow, the roads remained open.” The second version makes the first clause dependent.
| Intended relationship | Strong choice | Example |
|---|---|---|
| Add information | and | “The device is compact and durable.” |
| Show contrast | but, although, whereas | “The device is compact, but its screen is small.” |
| Give a reason | because, for, since | “The device failed because its battery was damaged.” |
| Show a result | so | “The battery was damaged, so the device failed.” |
| Set a condition | if, unless | “The device will work if the battery is replaced.” |
| Present alternatives | or, either/or | “Choose either the standard model or the upgraded model.” |
| Show time | when, before, after | “Back up the files before the device is reset.” |
A practical rule is to prefer the most specific conjunction available. Because is clearer than as when the sentence states a direct cause. Although is clearer than while when the writer means concession rather than simultaneous time.
How Do You Punctuate Conjunctions?
Punctuation depends on the type of conjunction and the structure of the connected units. A comma commonly follows an introductory dependent clause and precedes a coordinating conjunction joining two independent clauses, while no comma usually separates short, closely connected words or phrases.
When should you use a comma before and, but, or so?
Use a comma before a coordinating conjunction when both sides contain independent clauses. Do not use that comma simply because the sentence is long or because the conjunction is and.
- Correct: “The deadline changed, so the team revised its plan.”
- Correct: “The deadline changed so suddenly that nobody objected.”
- Correct: “The researcher collected data and analyzed the results.”
- Usually incorrect: “The researcher collected data, and analyzed the results.”
The first example has two complete clauses: “The deadline changed” and “the team revised its plan.” In the second, so introduces a result construction, but the material after it is not an independent clause in the same way.
A comma may improve readability in a long phrase even when grammar does not require one, but such editorial commas should not obscure the core clause rule.
Why are conjunctive adverbs different?
Conjunctive adverbs such as however, therefore, consequently, meanwhile, nevertheless, and otherwise cannot join two independent clauses with only a comma. Use a period or semicolon before the adverb, followed by a comma when the adverb interrupts or begins the next clause.
- Correct: “The evidence was limited; however, the committee approved the trial.”
- Correct: “The evidence was limited. However, the committee approved the trial.”
- Incorrect: “The evidence was limited, however, the committee approved the trial.”
A coordinating conjunction creates a grammatical link inside one sentence. A conjunctive adverb signals a transition between clauses but retains adverbial status, which explains the different punctuation.
Conjunction Examples by Relationship
Conjunction examples become easier to understand when grouped by the relationship they express. The same two basic ideas can produce different meanings depending on whether the writer chooses addition, contrast, cause, condition, or time.
| Relationship | Basic ideas | Combined sentence |
|---|---|---|
| Addition | “Nora cooks.” “Nora gardens.” | “Nora cooks and gardens.” |
| Contrast | “The plan is expensive.” “The plan is effective.” | “The plan is expensive, but it is effective.” |
| Cause | “The flight was delayed.” “Fog covered the runway.” | “The flight was delayed because fog covered the runway.” |
| Condition | “You follow the instructions.” “The installation will succeed.” | “The installation will succeed if you follow the instructions.” |
| Concession | “The sample was small.” “The pattern was consistent.” | “Although the sample was small, the pattern was consistent.” |
| Time | “The bell rang.” “Students entered.” | “When the bell rang, students entered.” |
| Choice | “We can walk.” “We can take a bus.” | “We can either walk or take a bus.” |
| Result | “The pipe froze.” “Water service stopped.” | “The pipe froze, so water service stopped.” |
Can a conjunction connect phrases instead of clauses?
A conjunction can connect phrases when the phrases have the same grammatical role. In “The clinic operates on Mondays and Thursdays,” and joins two prepositional phrases. In “The clinic operates in the morning or after lunch,” or joins two time expressions.
The joined phrases should be parallel enough for readers to interpret them quickly. “The policy applies to employees and contractors” is clear because both objects follow to conceptually, while “The policy applies to employees and working remotely” is mismatched and potentially ambiguous.
What Problems Cause Conjunction Errors?
The most common conjunction errors are comma splices, fragments, faulty parallelism, ambiguous relationships, and incorrect category labels. Each problem has a structural test and a predictable repair.
| Error | Faulty example | Reliable repair |
|---|---|---|
| Comma splice | “The bell rang, students left.” | “The bell rang, and students left.” |
| Fragment | “Because the bell rang.” | “Because the bell rang, students left.” |
| Missing clause comma | “The bell rang but students stayed.” | “The bell rang, but students stayed.” |
| Faulty parallelism | “Both reading and to write help.” | “Both reading and writing help.” |
| Wrong transition punctuation | “The bell rang, however students stayed.” | “The bell rang; however, students stayed.” |
| Ambiguous cause | “Since the office closed, we waited.” | Replace with “Because” or “After,” depending on meaning |
How do you repair a comma splice?
A comma splice joins two independent clauses with a comma alone. Repair it by adding a coordinating conjunction, replacing the comma with a semicolon, or separating the clauses into two sentences.
- Coordinating conjunction: “The forecast changed, so the event moved indoors.”
- Semicolon: “The forecast changed; the event moved indoors.”
- Two sentences: “The forecast changed. The event moved indoors.”
- Subordination: “Because the forecast changed, the event moved indoors.”
The best repair depends on meaning. A semicolon shows a close relationship without specifying whether the second clause is a reason or result, while so explicitly identifies the second clause as the consequence.
How do you identify a sentence fragment?
A sentence fragment often begins with a subordinating conjunction and contains a subject and verb but no independent clause. “Although the road was clear” is a dependent clause, not a complete sentence, because although makes the statement incomplete.
Attach the fragment to an independent clause: “Although the road was clear, the driver reduced speed.” A fragment can be intentional in dialogue, advertising, or creative prose, but formal essays, reports, and examinations normally require a complete construction.
What is the difference between a conjunction and a preposition?
A conjunction connects a clause when the word is followed by a subject and verb, while a preposition introduces a noun phrase or pronoun. The same word can belong to different categories depending on what follows it.
- Conjunction: “We stayed inside because the storm intensified.”
- Preposition: “We stayed inside because of the storm.”
- Conjunction: “Since the store opened, sales have increased.”
- Preposition: “Since Monday, sales have increased.”
Because is followed by a clause, but because of is a prepositional phrase. Since can express time or cause as a conjunction and time as a preposition.
Can Conjunctions Begin Sentences?
Conjunctions can begin sentences when the construction is complete and the connection is clear. Beginning with and, but, or so is not automatically ungrammatical; the restriction is largely a traditional style preference rather than a universal rule of modern English.
- “But the evidence points to a different conclusion.”
- “And the second test produced the same result.”
- “So the committee postponed the vote.”
In formal writing, repeated sentence openings with and or but can create a choppy rhythm. One sentence beginning with But may provide useful contrast, while five consecutive openings can make the prose feel mechanically repetitive.
A sentence should not begin with a conjunction merely to disguise a fragment. “And because the data were incomplete” remains a fragment unless it connects to a complete clause.
Which Conjunction Should You Use in Formal, Academic, or Creative Writing?
Formal writing benefits from conjunctions that identify relationships precisely, academic writing often requires explicit cause and concession, and creative writing may deliberately repeat or omit conjunctions for rhythm. No category is inherently more intelligent or professional than another.
For language learners
Start with and, but, or, because, if, when, and although. These words cover the most common relationships and allow learners to build compound and complex sentences without excessive syntactic risk.
Check whether each clause is complete before adding a comma. Then practice changing one sentence into two versions: “Although sales fell, the company expanded,” and “Sales fell, but the company expanded.” The first creates subordination; the second balances the clauses.
For business and academic writing
Use because for direct reasons, therefore with correct conjunctive-adverb punctuation, and although when acknowledging an opposing fact. Avoid vague connectors when the relationship matters to a decision.
Compare “The project was delayed as the supplier changed its schedule” with “The project was delayed because the supplier changed its schedule.” The second version states causation more directly and reduces interpretive effort.
For creative writing
Writers may use polysyndeton, the repeated use of conjunctions, to slow rhythm or create accumulation: “The wind and rain and darkness filled the street.” Asyndeton omits expected conjunctions to accelerate a sequence: “She opened the door, stepped inside, locked it.”
These are deliberate style choices, not substitutes for grammatical control. Creative effect works best when the writer knows which standard construction is being altered.
What Are the Best Alternatives to Conjunctions?
Punctuation and sentence restructuring can express relationships without a traditional conjunction. Alternatives include a period, semicolon, colon, relative pronoun, participial phrase, or separate sentence with a transition.
| Intended relationship | Conjunction version | Alternative |
|---|---|---|
| Close connection | “The test failed, so we repeated it.” | “The test failed; we repeated it.” |
| Explanation | “The test failed because the sample leaked.” | “The test failed: the sample leaked.” |
| Contrast | “The sample was small, but the result was stable.” | “The sample was small. Nevertheless, the result was stable.” |
| Time | “After the inspection ended, workers left.” | “The inspection ended; afterward, workers left.” |
| Addition | “The tool is inexpensive and reliable.” | “The tool is inexpensive, as well as reliable.” |
Alternatives change emphasis and sometimes register. A colon introduces an explanation, a semicolon leaves the relationship more implicit, and a transition such as nevertheless requires punctuation as a conjunctive adverb.
Expert Rules for Accurate Conjunction Usage
Rule 1: Test independence, not length. A short clause can be independent, and a long phrase can be dependent. The question is whether the unit expresses a complete thought with a subject and finite verb.
Rule 2: Preserve parallelism across paired conjunctions. After both, either, neither, or not only, predict the grammatical form that follows the second member before completing the sentence.
Rule 3: Choose meaning before punctuation. Writers often place a comma first and select a conjunction afterward. Reverse that order: identify the relationship, choose the connector, then apply the punctuation rule.
Rule 4: Treat “since,” “as,” and “while” as potentially ambiguous. Each can express more than one relationship, so replace them when readers could mistake cause for time, or concession for simultaneity.
Rule 5: Do not treat every transition as a conjunction. However, therefore, and meanwhile cannot repair a comma splice by themselves.
FAQ
Is “because” a conjunction?
Because is usually a subordinating conjunction when it introduces a clause, as in “The match ended because rain intensified.” Because of is a preposition followed by a noun phrase, as in “The match ended because of rain.” The two constructions express related meanings but require different grammatical complements.
What is the easiest way to remember coordinating conjunctions?
Remember the acronym FANBOYS: for, and, nor, but, or, yet, so. The acronym identifies the seven traditional coordinating conjunctions, but it does not tell you which relationship each word expresses. Learn the meaning and test whether both sides of the conjunction are independent clauses before adding a comma.
Is “that” a conjunction?
That can function as a subordinating conjunction, often called a complementizer, when it introduces a noun clause: “The analyst reported that demand had increased.” In other sentences, that may be a demonstrative determiner, pronoun, or relative marker, so its category depends on its position and grammatical function.
What is the difference between “although” and “but”?
Although introduces a dependent clause, while but coordinates two equal clauses or phrases. “Although the route is longer, it is safer” gives the first idea subordinate status. “The route is longer, but it is safer” presents the two ideas as coordinated contrast.
Can “and” join two complete sentences?
And can join two independent clauses when a comma appears before it: “The gate opened, and the visitors entered.” It can also join words or phrases without a comma: “The visitors entered and found their seats.” The comma decision depends on whether the second part is an independent clause.
Why is “however” not a coordinating conjunction?
However is a conjunctive adverb, so it signals contrast without grammatically coordinating two independent clauses. Write “The method is simple; however, the results vary” or use two sentences. Writing “The method is simple, however, the results vary” creates a comma splice.
Conclusion: Conjunction Definition Usage and Examples
Conjunctions connect words, phrases, and clauses while expressing relationships such as addition, contrast, cause, condition, time, choice, and result. For accurate conjunction definition usage and examples, identify the relationship first, distinguish coordinating from subordinating and correlative forms, test clause independence, preserve parallel structure, and apply punctuation only after the grammar is clear.
