5. Conjunctions
Overview
Conjunctions are the connective tissue of language, binding words, phrases, and clauses into coherent, meaningful sentences. They signal relationships such as addition, contrast, condition, cause, and result, guiding readers through a writer's logic. Mastering the three major categories of conjunctions and their accompanying rules is essential for producing polished, grammatically sound writing. This chapter covers coordinating, subordinating, and correlative conjunctions along with the most frequently tested usage rules.
Definition
A conjunction is a part of speech whose primary function is to join grammatical units, ranging from individual words to entire clauses, so that the relationship between those units becomes clear. Depending on its type, a conjunction may link elements of equal grammatical weight, attach a dependent clause to a main clause, or work together with a partner word to frame paired elements within a sentence.
Key Rules
-
1. Grammatical Parallelism
When a conjunction links two or more elements, every element must belong to the same grammatical category. Mixing infinitives with gerunds, or phrases with single words, disrupts the balance that readers expect.
Show example
ExampleThe coach praised the team for playing passionately and defending intelligently.
-
2. Subject-Verb Agreement with Alternative Pairs
When subjects of different numbers or persons are joined by 'either...or' or 'neither...nor', the verb takes its number from whichever subject appears closest to it in the sentence.
Show example
ExampleNeither the manager nor the employees were satisfied with the new policy.
-
3. Comma Before a Coordinating Conjunction
A comma must appear immediately before a coordinating conjunction (any of the FANBOYS words) when that conjunction is used to join two complete, independently standing clauses.
Show example
ExampleWe wanted to buy tickets to the concert, but the event had already sold out.
-
4. Comma After an Introductory Dependent Clause
When a subordinating conjunction opens a sentence by introducing the dependent clause first, a comma is required at the point where that dependent clause ends and the main clause begins.
Show example
ExampleSince we had some extra time before the meeting, we decided to grab a cup of coffee.
-
5. Integrity of Correlative Pairs
Each correlative conjunction is one half of a fixed partnership; the two halves cannot be swapped out or mixed with words from other pairings. Using 'and' or 'or' in place of the expected partner word produces an incorrect construction.
Show example
ExampleShe is not only an accomplished pianist but also a skilled violinist.
-
6. 'No Sooner' Requires 'Than'
The expression 'no sooner' introduces an action that is immediately followed by another. The second action must be introduced by 'than'; substituting 'when' or 'then' is a grammatical error.
Show example
ExampleNo sooner had the plane landed than the passengers began unbuckling their seatbelts.
-
7. 'Hardly' and 'Scarcely' Require 'When'
When 'hardly' or 'scarcely' opens a clause to describe an event that was barely completed before something else occurred, the following clause must be introduced by 'when' or 'before', never by 'than'.
Show example
ExampleScarcely had the speaker walked onto the stage when the crowd erupted in applause.
-
8. 'Neither' Pairs Only with 'Nor'
Because 'neither' already carries a negative meaning, the second element it governs must be introduced by 'nor', not by 'or'. Using 'or' after 'neither' produces a grammatically invalid construction.
Show example
ExampleThe traveler could speak neither French nor Spanish.
-
9. Parallel Structure with 'Both...And'
The pair 'both...and' must be followed by two grammatically equivalent elements. Placing 'both' and 'and' so that they each precede a structurally different item violates the parallelism the pair demands.
Show example
ExampleThe program benefits both the environment and the local economy.
-
10. No Double Negative After 'Lest'
The conjunction 'lest' carries an inherent negative sense meaning 'for fear that something undesirable will happen'. Adding 'not' to the clause that follows it creates an unintended double negative; the clause should use 'should' without any negative marker.
Show example
ExampleWe walked quietly lest we should disturb the sleeping baby.
Example Sentences
-
Example 1
She wore a heavy coat, for the winter wind was biting.
Why this works
Illustrates 'for' as a coordinating conjunction expressing reason or cause.
-
Example 2
The children laughed and played in the yard all afternoon.
Why this works
Illustrates 'and' joining two parallel action verbs to express addition.
-
Example 3
He did not call, nor did he write a single letter.
Why this works
Illustrates 'nor' introducing a negative alternative with subject-verb inversion.
-
Example 4
The puzzle was challenging but enjoyable to complete.
Why this works
Illustrates 'but' marking contrast between two adjectives.
-
Example 5
You can submit the assignment by email or upload it to the portal.
Why this works
Illustrates 'or' presenting two choices or alternatives.
-
Example 6
The runner felt exhausted, yet she crossed the finish line with a smile.
Why this works
Illustrates 'yet' conveying an unexpected or contrasting result.
-
Example 7
The roads were icy, so we decided to stay indoors.
Why this works
Illustrates 'so' signalling a result or consequence.
-
Example 8
Although it was raining heavily, the hike went ahead as scheduled.
Why this works
Illustrates a subordinating conjunction introducing a concessive clause.
-
Example 9
You will not receive a refund unless you present a valid receipt.
Why this works
Illustrates 'unless' introducing a restrictive negative condition.
-
Example 10
We can complete the project on time as long as everyone cooperates.
Why this works
Illustrates 'as long as' expressing a conditional time boundary.
-
Example 11
Keep an umbrella in your bag in case the weather changes suddenly.
Why this works
Illustrates 'in case' expressing precautionary purpose.
-
Example 12
We can either order pizza or cook pasta for dinner.
Why this works
Illustrates 'either...or' offering two mutually exclusive alternatives.
-
Example 13
She preferred to read a novel rather than watch television.
Why this works
Illustrates 'rather...than' indicating preference between two options.
-
Example 14
We must decide whether to invest in the project now or wait until next year.
Why this works
Illustrates 'whether...or' presenting two open possibilities.
Common Errors
-
No sooner had I started the presentation when the projector failed.
No sooner had I started the presentation than the projector failed.
-
Either he must clean his room or wash the dishes.
He must either clean his room or wash the dishes.
-
Although he was extremely tired, but he finished the assignment.
Although he was extremely tired, he finished the assignment.
-
I cannot go to the party unless I don't finish my homework.
I cannot go to the party unless I finish my homework.
-
She is not only clever, and also very polite.
She is not only clever but also very polite.
Key Takeaways
- Conjunctions establish logical relationships such as contrast, reason, addition, condition, and time between elements within a sentence.
- Coordinating conjunctions (the FANBOYS group) join grammatically equal elements and require a comma before them when linking two independent clauses.
- Subordinating conjunctions attach a dependent clause to a main clause; when the dependent clause comes first, a comma must follow it.
- Correlative conjunctions operate in fixed, inseparable pairs and demand that both joined elements have parallel grammatical structures.
- The conjunction 'lest' is inherently negative and must be followed by 'should' without any additional negative word.
- Use 'than' after 'no sooner' and 'when' after 'hardly' or 'scarcely'; confusing these pairings is one of the most common examination errors.
- Double negatives with conjunctions like 'unless' and 'lest' are grammatically incorrect and must be avoided.
Practice - Set 1
-
Identify the grammatically incorrect sentence.
Not quite — take another look, or reveal the answer below.
Correct answer: B
Explanation'No sooner' must always be paired with 'than,' not 'when.' Option B incorrectly uses 'when' and is therefore grammatically wrong.
-
Select the word that correctly completes the sentence: "Scarcely had the concert started ________ the power went out."
Not quite — take another look, or reveal the answer below.
Correct answer: C
ExplanationNegative adverbs like 'scarcely' and 'hardly' must be paired with 'when' (or 'before') to introduce the subsequent event; 'than' and 'then' are both incorrect in this construction.
-
Which of the following sentences maintains correct parallel structure?
Not quite — take another look, or reveal the answer below.
Correct answer: B
ExplanationAll three items in the list must share the same grammatical form. Only option B uses matching gerunds throughout: hiking, swimming, and riding.
-
Which sentence uses 'lest' correctly?
Not quite — take another look, or reveal the answer below.
Correct answer: C
Explanation'Lest' is inherently negative ('for fear that'), so adding 'not' creates a double negative. The correct construction uses 'should' without any negative marker, as in option C.
-
Choose the correct verb form: "Neither the captain nor the crew members ________ aware of the incoming storm."
Not quite — take another look, or reveal the answer below.
Correct answer: B
ExplanationWith 'neither...nor', the verb agrees with the subject closest to it. Since 'crew members' is plural, the plural verb 'were' is required.
-
Identify the grammatically incorrect sentence.
Not quite — take another look, or reveal the answer below.
Correct answer: D
ExplanationThe correlative conjunction 'not only' must pair with 'but also,' not with 'and.' Option D breaks this fixed pair and is therefore incorrect.
-
Choose the word that correctly completes the sentence: "The suspect would neither confess to the crime ________ reveal where the stolen goods were hidden."
Not quite — take another look, or reveal the answer below.
Correct answer: B
Explanation'Neither' must always be paired with 'nor' to express a double negative construction; using 'or', 'but', or 'and' is grammatically incorrect.
Practice - Set 2
-
Which of the following sentences is correctly punctuated?
Not quite — take another look, or reveal the answer below.
Correct answer: B
ExplanationWhen a subordinating conjunction opens the sentence and introduces the dependent clause, a comma must follow that clause before the main clause begins. Only option B places the comma correctly.
-
Identify the grammatically incorrect sentence.
Not quite — take another look, or reveal the answer below.
Correct answer: C
ExplanationThe correlative conjunction 'both' must always be paired with 'and,' not with 'as well as.' Option C substitutes 'as well as' for 'and', making it incorrect.
-
Which sentence demonstrates correct punctuation when joining two independent clauses with a coordinating conjunction?
Not quite — take another look, or reveal the answer below.
Correct answer: B
ExplanationA comma is placed directly before the coordinating conjunction when it links two independent clauses. Only option B punctuates this correctly.
-
Choose the sentence in which 'although' is used correctly.
Not quite — take another look, or reveal the answer below.
Correct answer: C
Explanation'Although' is a subordinating conjunction that does not require a coordinating conjunction like 'but' or 'yet' in the same sentence. Option C correctly introduces the main clause without a redundant conjunction.
-
Select the correct option to fill in the blank: "Work hard ________ you should fail the examination."
Not quite — take another look, or reveal the answer below.
Correct answer: C
Explanation'Lest' means 'for fear that' and is the appropriate conjunction to express the negative consequence one wishes to avoid. The sentence correctly uses 'lest...should' construction.
-
Which sentence correctly uses 'either...or'?
Not quite — take another look, or reveal the answer below.
Correct answer: B
ExplanationFor parallel structure, 'either' must be placed immediately before the first of the two parallel elements. In option B, 'either' precedes 'apologise' and 'or' precedes 'leave', both verbs, maintaining correct parallelism.
-
Identify the sentence that uses 'unless' correctly.
Not quite — take another look, or reveal the answer below.
Correct answer: B
Explanation'Unless' already carries a conditional negative meaning ('if not'), so adding 'don't' creates a double negative. Option B uses 'unless' without an additional negative, which is correct. Option D is incorrect because 'unless' should be followed by a simple present tense, not 'will'.
Practice - Set 3
-
Which of the following sentences correctly uses a subordinating conjunction at the beginning?
Not quite — take another look, or reveal the answer below.
Correct answer: B
ExplanationWhen a subordinating conjunction like 'because' introduces the sentence, a comma must separate the dependent clause from the main clause. Option B places the comma correctly. Option D reverses the logical relationship between the two clauses.
Live speaking practice
Speak it out: Conjunctions
You are organizing a major college festival in Bengaluru, and you need to coordinate the final schedule with your co-organizer under a tight budget and strict deadlines.
- Read your scene and goals
- Talk it out; goals tick off live
- Get a score and stronger lines
Your voice and your AI key never touch our servers; the key stays in this browser and is sent only to Google. Only your round scores are saved to track progress.