In short: A conjunction is a part of speech that connects words, phrases, or clauses within a sentence, establishing logical relationships such as addition, contrast, condition, cause, or purpose. Standard English grammar categorises conjunctions into three primary classes: coordinating conjunctions, subordinating conjunctions, and correlative conjunctions, each governed by specific punctuation and syntactic rules.
Every language requires words that join thoughts together. Without conjunctions, speech and writing would consist of short, disconnected statements. Conjunctions are the essential connectors that link words, phrases, and clauses into clear, coherent sentences, allowing ideas to flow smoothly across paragraphs.
For students in Class 5 to 12 across CBSE, ICSE, and Cambridge curricula, conjunctions are central to scoring well in English language papers. Examiners regularly test clause coordination, subordinating punctuation, correlative parallelism, and inversion patterns in sentence transformation tasks.
What a conjunction is and how it functions in sentences
A conjunction is a joining word that connects words, phrases, or clauses, establishing logical links between sentence components. Without conjunctions, writers would be forced to express every observation in a separate simple sentence.
In school grammar syllabuses, conjunctions are grouped by syntactic rank. Coordinating conjunctions link elements of equal standing, subordinating conjunctions attach dependent clauses to main clauses, and correlative conjunctions work in matched pairs.
- Word-level links: connects individual words sharing the same grammatical class.
- Phrase-level links: connects prepositional, noun, or verb phrases of equal standing.
- Clause-level links: connects independent clauses or anchors subordinate clauses to main clauses.
| Syntactic unit | Grammatical function | Connector | Example sentence |
|---|---|---|---|
| Words | Links two nouns of equal standing | and | Aarav and Priya represented our school at the Jaipur literary festival. |
| Phrases | Links prepositional phrases | or | You can submit the assignment through the online portal or at the department office. |
| Clauses | Coordinates two complete thoughts | but | The cricket team practised diligently every afternoon, but heavy rain washed out the match. |
Coordinating conjunctions and the FANBOYS framework
Coordinating conjunctions connect grammatical units of identical structural importance. They link a noun to a noun, a phrase to a phrase, or an independent clause to an independent clause. Modern English has seven coordinating conjunctions, remembered through the mnemonic FANBOYS: For, And, Nor, But, Or, Yet, and So.
Each coordinator signals a distinct logical relationship: addition, contrast, alternative, explanation, or result. When joining two independent clauses, place a comma before the coordinator. When linking compound verbs with a shared subject, omit the comma.
- Addition and contrast: 'and' joins supplementary ideas, while 'but' and 'yet' mark contrast.
- Choice and negation: 'or' presents alternatives, while 'nor' introduces negative continuation.
- Reason and result: 'for' introduces formal explanation, while 'so' signals consequence.
| Coordinator | Logical relation | Punctuation rule | Example sentence |
|---|---|---|---|
| for | Reason or explanation | Comma before coordinator | The botanist documented the rare orchid carefully, for it bloomed only once a decade. |
| nor | Negative alternative | Inverts subject and auxiliary | Dev did not complete his chemistry notes, nor did he attend the revision practical. |
| yet | Surprising concession | Comma before coordinator | The temperature dropped sharply after sunset, yet the scouts remained cheerful around the camp. |
Subordinating conjunctions and complex sentence structures
Subordinating conjunctions connect an independent clause to a dependent clause. An independent clause expresses a complete thought. A subordinate clause begins with a subordinating conjunction and depends on the main clause for its full sense.
Subordinating conjunctions express time, reason, condition, concession, or purpose. When a subordinate clause opens a sentence, place a comma after it. When it follows the main clause, no comma is needed.
- Time: when, while, after, before, since, until, once, as soon as.
- Cause and condition: because, since, as, if, unless, provided that.
- Concession and purpose: although, though, even though, whereas, so that.
| Category | Key conjunctions | Punctuation rule | Example sentence |
|---|---|---|---|
| Time | while, until, when | Comma after introductory clause | While the invigilator checked admission tickets, the candidates sharpened their pencils. |
| Condition | unless, if, provided that | Comma after introductory clause | Unless you review the previous test papers, you will miss recurrent question patterns. |
| Concession | although, though, whereas | Comma separates opening clause | Although the history syllabus was extensive, Rohan finished his revision before dinner. |
Correlative conjunctions and grammatical parallelism
Correlative conjunctions work in pairs to link balanced elements in a sentence. Key pairs include 'both... and', 'either... or', 'neither... nor', and 'not only... but also'. These connectors require strict grammatical parallelism.
Parallelism requires matching structures after both conjunctions. With 'either... or' and 'neither... nor', the verb agrees in number with the nearer subject.
- Parallel syntax: match noun with noun, verb with verb, and phrase with phrase.
- Proximity agreement rule: with 'either/or' and 'neither/nor', the verb agrees with the nearer subject.
- Plural agreement rule: subjects linked by 'both... and' universally take plural verbs.
| Correlative pair | Grammatical balance | Agreement rule | Example sentence |
|---|---|---|---|
| both... and | Noun phrase with noun phrase | Always takes a plural verb | Both the senior headmaster and the house prefects attended the annual sports assembly. |
| neither... nor | Plural noun with singular noun | Verb agrees with closer noun | Neither the team captains nor the coach was satisfied with the damp condition of the pitch. |
| not only... but also | Verb phrase with verb phrase | Strict parallel placement | The guest speaker not only delivered an inspiring lecture but also answered every student query. |
Conjunctive adverbs versus true conjunctions
Conjunctive adverbs include words such as 'however', 'therefore', 'nevertheless', 'furthermore', and 'consequently'. While they indicate transitions between ideas, they are grammatically adverbs, not true conjunctions.
A conjunctive adverb cannot join clauses with only a comma. Join independent clauses using a semicolon before the adverb and a comma after it, or use a full stop.
- Syntactic status: conjunctive adverbs are modifiers, not grammatical coordinators.
- Punctuation rule: use a semicolon before and a comma after between independent clauses.
- Sentence separation: use a full stop before the adverb when starting a fresh sentence.
| Conjunctive adverb | Transition type | Punctuation pattern | Example sentence |
|---|---|---|---|
| however | Contrast or qualification | Semicolon before, comma after | The experiment yielded unexpected readings; however, the physics instructor verified the methodology. |
| therefore | Logical deduction | Period before, comma after | The monsoon arrived earlier than anticipated. Therefore, municipal staff inspected all drainage channels. |
| consequently | Direct result | Semicolon before, comma after | The train signals failed near the junction; consequently, three express trains arrived with slight delays. |
Inversion with negative and restrictive conjunctions
Examiners frequently test sentence transformations with restrictive conjunctions. When phrases like 'no sooner', 'hardly', or 'scarcely' open a sentence, English requires subject-auxiliary inversion, placing the auxiliary verb before the subject.
Each restrictive word requires a fixed correlative partner. 'No sooner' pairs exclusively with 'than', whereas 'hardly' and 'scarcely' pair with 'when'. Conflating these partners results in an immediate loss of marks.
- Past perfect inversion: place 'had' before the subject, followed by the past participle.
- Past simple inversion: place 'did' before the subject, followed by the base infinitive.
- Mandatory pairing: pair 'no sooner' with 'than'; pair 'hardly' and 'scarcely' with 'when'.
| Connector | Inversion pattern | Partner | Example sentence |
|---|---|---|---|
| No sooner | Had + subject + past participle | than | No sooner had the invigilator collected the answer scripts than the storm broke over the school. |
| No sooner | Did + subject + base verb | than | No sooner did the train halt at the platform than passengers moved towards the exits. |
| Hardly | Had + subject + past participle | when | Hardly had the headmistress begun her address when a sudden power failure darkened the auditorium. |
Sentence synthesis and transformation using conjunctions
Sentence synthesis combines two or more simple sentences into a single coherent sentence without altering the original meaning. In CBSE and ICSE papers, conjunctions provide the primary mechanism for sentence transformation.
Common exercises include replacing 'too... to' with 'so... that... not', converting 'if... not' into 'unless', and changing 'as soon as' into inverted 'no sooner... than' patterns. Maintaining verb tense is essential.
- Replacing 'too... to' with 'so... that': ensure the negative modal aligns with past or present tense.
- Replacing 'if... not' with 'unless': remove negative auxiliary verbs from the subordinate clause.
- Converting 'as soon as' to 'no sooner': invert auxiliary verb and subject with 'than'.
| Original pattern | Target connector | Transformation rule | Example sentence |
|---|---|---|---|
| too... to | so... that... not | Keep modal tense consistent | The mathematical riddle was so intricate that none of the candidates could solve it within the hour. |
| If... not | unless | Remove negation from the clause | Unless the committee receives revised estimates by Friday, the construction project will be delayed. |
| As soon as | No sooner... than | Invert auxiliary verb and subject | No sooner had the whistle sounded than the sprint runners leapt from their starting blocks. |
Common mistakes
| Wrong | Right | Why |
|---|---|---|
| Although the physics paper was difficult, but Aryan secured top marks. | Although the physics paper was difficult, Aryan secured top marks. | 'Although' connects the subordinate clause to the main clause. Adding 'but' creates an ungrammatical double conjunction. Use either connector, never both. |
| The debate team practised every weekend, however they lost the final. | The debate team practised every weekend; however, they lost the final. | 'However' is an adverb and cannot join clauses with a comma alone. Use a semicolon before 'however' and a comma after it. |
| Aarav not only bought a fountain pen, but also a leather notebook. | Aarav bought not only a fountain pen, but also a leather notebook. | Correlative pairs must introduce equivalent structures. Because 'a leather notebook' is a noun phrase, 'not only' must precede the noun phrase 'a fountain pen'. |
| No sooner had the assembly commenced when the microphone failed. | No sooner had the assembly commenced than the microphone failed. | 'No sooner' is comparative and must pair with 'than'. 'When' pairs only with 'hardly', 'scarcely', or 'barely'. |
| Unless you do not submit the project on time, you will lose marks. | Unless you submit the project on time, you will lose marks. | 'Unless' already means 'if... not'. Adding 'do not' creates an incorrect double negative. Keep the clause affirmative. |
| Neither the principal nor the senior teachers was present at the rehearsal. | Neither the principal nor the senior teachers were present at the rehearsal. | With 'neither... nor', the verb agrees with the nearer subject. Because 'senior teachers' is plural and sits closer to the verb, use 'were'. |
Exam tips
- Memorise fixed pairs: 'no sooner' takes 'than', while 'hardly' and 'scarcely' take 'when'. Invert the auxiliary verb and subject immediately after them.
- Avoid double connectors in examination essays. Never combine 'although' with 'but', and never combine 'because' or 'since' with 'therefore' or 'so'.
- When rewriting 'too... to' into 'so... that', align modal verbs with clause tense: use 'cannot' for present tense sentences and 'could not' for past tense sentences.
- Ensure strict parallelism with 'not only... but also'. If 'but also' introduces a prepositional phrase, place 'not only' before the matching phrase.
- Read sentence synthesis questions carefully to confirm whether the examiner specifies a simple, compound, or complex sentence before selecting your conjunction.
Practice questions
Try each one, then open the answer.
- Identify the conjunctions: 'Although Rohit revised, he felt nervous, so he consulted his teacher.'
Answer
'Although' is a subordinating conjunction. 'So' is a coordinating conjunction. - Fill in the blank: 'Scarcely had the train left Jaipur junction _____ the rain began.'
Answer
'when'. The restrictive word 'scarcely' pairs with 'when', never with 'than'. - Combine using a coordinator: 'The library bought new atlases. It also ordered encyclopaedias.'
Answer
'The library bought new atlases, and it also ordered encyclopaedias.' - Correct the parallelism: 'The headmaster not only praised Aryan for diligence, but also for sports.'
Answer
'The headmaster praised Aryan not only for diligence, but also for sports.' - Transform using 'No sooner... than': 'As soon as the principal spoke, the hall fell silent.'
Answer
'No sooner had the principal spoken than the hall fell silent.' - Choose the correct verb: 'Neither the prefect nor the wardens (was / were) informed.'
Answer
'were'. Under proximity agreement, the verb matches the closer plural subject 'wardens'. - Correct the error: 'Because the laboratory was closed, therefore practicals were cancelled.'
Answer
'Because the laboratory was closed, practicals were cancelled.' - Rewrite using 'Unless': 'If you do not register before Wednesday, you cannot compete.'
Answer
'Unless you register before Wednesday, you cannot compete.' - Punctuate correctly: 'Jaipur attracts tourists in winter however many visit during summer.'
Answer
'Jaipur attracts tourists in winter; however, many visit during summer.' - Combine using 'so... that': 'The question was extremely hard. None of the pupils understood it.'
Answer
'The question was so hard that none of the pupils understood it.'
Questions students ask
What is the primary difference between coordinating and subordinating conjunctions?
Can you start a sentence with 'And' or 'But' in formal school essays?
What is the difference between 'because', 'since', and 'as' when expressing cause?
How do you properly punctuate conjunctive adverbs like 'however' and 'therefore'?
Why is it grammatically incorrect to use 'although' and 'but' in the same sentence?
Keep practising
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Written by the Reportcards English team, reviewed by Dr. Vishruti Arora. Updated 4 November 2026.