The correlative conjunction “not only… but also” is a powerful tool in English grammar, enabling speakers and writers to connect two related ideas or elements with emphasis and clarity. Mastering its usage can significantly enhance sentence structure, add sophistication to prose, and ensure that parallel ideas are presented effectively.
This construction highlights a dual focus, indicating that two things are true or happening simultaneously, with the second element often carrying a greater degree of importance or surprise. Understanding the underlying rules and common pitfalls is essential for its correct application.
Understanding the Core Function of “Not Only… But Also”
At its heart, “not only… but also” serves to link two parallel grammatical structures, ensuring that the sentence maintains balance and coherence. This parallelism is crucial for readability and avoiding confusion. The structure emphasizes that both parts of the conjunction are equally valid, yet the “but also” clause often introduces an additional, perhaps more significant, element.
The phrase functions as a correlative conjunction, meaning it always appears in pairs to connect grammatically equivalent items. These items can be words, phrases, or even entire clauses, as long as they serve the same grammatical purpose within the sentence.
Correct usage ensures that the reader understands that two distinct but related points are being made. This creates a more nuanced and impactful statement than simply listing the items separately.
Rule 1: Maintaining Grammatical Parallelism
The most critical rule for using “not only… but also” correctly is to ensure that the grammatical structure following “not only” is identical to the structure following “but also.” This principle of parallelism is non-negotiable for clear and effective communication.
For instance, if “not only” is followed by a verb, then “but also” must also be followed by a verb in the same tense and form. Similarly, if it’s followed by a noun phrase, the second part should also be a noun phrase. Failure to adhere to this rule results in awkward, confusing, and grammatically incorrect sentences.
Consider the example: “She not only sings beautifully but also dances gracefully.” Here, “sings” (verb) is paralleled by “dances” (verb), maintaining the correct structure. An incorrect version would be: “She not only sings beautifully but also a graceful dancer.” This breaks parallelism because a verb is followed by a noun phrase.
Parallelism with Nouns and Noun Phrases
When connecting nouns or noun phrases, the parallelism must be maintained consistently. This means that if you start with a single noun after “not only,” you should follow with a single noun after “but also.”
Example: “The book contains not only vivid descriptions but also profound insights into human nature.” Both “vivid descriptions” and “profound insights into human nature” are noun phrases, adhering to the parallelism rule.
This ensures that the two elements being compared or linked are presented on an equal grammatical footing, enhancing the sentence’s clarity and flow.
Parallelism with Verbs and Verb Phrases
Connecting verbs or verb phrases requires careful attention to tense and form. If “not only” precedes a present tense verb, “but also” should precede another present tense verb.
Example: “He not only completed the project on time but also exceeded all expectations.” Here, “completed” and “exceeded” are both past tense verbs, creating perfect parallelism.
This consistency prevents grammatical disruptions and makes the sentence easier for the reader to process.
Parallelism with Adjectives and Adverbs
The same principle applies when connecting adjectives or adverbs. The modifier following “not only” must be of the same type and function as the modifier following “but also.”
Example: “The weather was not only cold but also windy.” “Cold” and “windy” are both adjectives describing the weather, maintaining parallel structure.
Incorrect usage, such as “The weather was not only cold but also with strong winds,” would be grammatically flawed.
Parallelism with Prepositional Phrases
Connecting prepositional phrases with “not only… but also” requires that both phrases begin with the same preposition or function similarly within the sentence’s structure.
Example: “She found the solution not only in the library but also in her own notes.” Both “in the library” and “in her own notes” are prepositional phrases starting with “in,” ensuring parallelism.
This structural consistency reinforces the connection between the two locations or sources of the solution.
Parallelism with Clauses
When “not only… but also” connects two independent or dependent clauses, the structure of both clauses must be parallel. This means they should have similar subject-verb arrangements or subordinate structures.
Example: “Not only did he apologize for his mistake, but he also offered to make amends.” Both parts of the sentence are structured as clauses, with “did he apologize” and “he offered” demonstrating parallel grammatical construction, albeit with inversion in the first clause due to its initial position.
This sophisticated use of the correlative conjunction can add significant weight and complexity to arguments or descriptions.
Rule 2: Placement of “Not Only” and “But Also”
The position of “not only” and “but also” within a sentence is critical. They should be placed immediately before the elements they are connecting to maintain clarity and avoid ambiguity. Misplacement can lead to misinterpretation or grammatical errors.
Generally, “not only” should precede the first element, and “but also” should precede the second element, ensuring that the scope of the conjunction is clear. The closer these correlatives are to the elements they link, the more effective and straightforward the sentence will be.
Think of them as signposts guiding the reader through the sentence’s structure. Their precise placement ensures that the intended meaning is conveyed without any doubt.
Placement Before Verbs
When connecting verbs, “not only” should come before the first verb, and “but also” before the second verb, assuming the subjects are the same. This emphasizes the actions being performed.
Example: “The team not only worked hard but also collaborated effectively.” Here, “worked hard” and “collaborated effectively” are the verb phrases being connected.
This positioning highlights the dual efforts or achievements of the subject.
Placement Before Nouns
If “not only” and “but also” precede nouns or noun phrases, they should be placed directly before these elements to clearly indicate what is being linked.
Example: “The exhibition featured not only rare paintings but also intricate sculptures.” This clearly links “rare paintings” and “intricate sculptures” as the items featured.
This ensures that the reader understands that both categories of items are part of the exhibition.
Placement Before Adjectives
Similarly, when connecting adjectives, “not only” and “but also” should precede the adjectives they modify to ensure the adjectives are understood as describing the same noun.
Example: “The meal was not only delicious but also beautifully presented.” “Delicious” and “beautifully presented” are adjectives describing “meal.”
This grammatical arrangement clearly attributes both qualities to the subject.
Placement Before Adverbs
Connecting adverbs requires placing “not only” and “but also” immediately before the adverbs to specify how actions are performed or described.
Example: “She spoke not only clearly but also persuasively.” This clarifies that both “clearly” and “persuasively” describe the manner of her speech.
The precise placement of these correlatives is key to avoiding ambiguity in adverbial modification.
Placement at the Beginning of Clauses
Sometimes, for stylistic emphasis, “not only” can begin a sentence, followed by an inverted verb-subject structure, with “but also” appearing later in the sentence, typically before the second clause’s main verb.
Example: “Not only did the company increase its profits, but it also expanded its market share.” This structure adds a dramatic flair and emphasizes the initial achievement before introducing the subsequent one.
This stylistic choice requires careful handling to maintain grammatical correctness and sentence flow.
Rule 3: Subject-Verb Agreement
When “not only… but also” connects two subjects, the verb must agree in number with the subject that is closer to it. This is a common point of confusion for many learners of English.
This rule applies specifically when the subjects joined by the correlative conjunction are different. The verb’s form then depends on which subject is nearest.
Pay close attention to the subject immediately preceding the verb when using this construction with differing subjects.
Differing Subjects – Proximity Rule
When the subjects linked by “not only… but also” are different, the verb agrees with the subject closest to it. This is the standard rule for compound subjects joined by correlative conjunctions like “either… or,” “neither… nor,” and “not only… but also.”
Example: “Not only the students but also the teacher understands the complex theory.” Here, “teacher” is the subject closest to the verb “understands,” and since “teacher” is singular, the verb is singular.
Conversely, “Not only the teacher but also the students understand the complex theory.” In this case, “students” is closest to the verb “understand,” which is plural, and thus the verb is plural.
Same Subjects
If the subjects connected by “not only… but also” are the same, then the verb simply agrees with that singular or plural subject as usual. The correlative conjunction itself does not alter the agreement in this scenario.
Example: “The dog not only barks loudly but also chases squirrels.” Here, “dog” is the singular subject, and “barks” and “chases” are singular verbs agreeing with it.
The presence of “not only… but also” does not complicate subject-verb agreement when the subjects are identical.
Common Errors and How to Avoid Them
One of the most frequent mistakes involves the violation of parallelism. Sentences become awkward and grammatically unsound when the structures following “not only” and “but also” do not match.
Always double-check that you are connecting like with like – verb with verb, noun with noun, phrase with phrase. This simple check can save a sentence from grammatical ruin.
Another common error is misplacing the correlative conjunctions, leading to ambiguity about what elements are actually being linked.
Incomplete Parallelism
This error occurs when the grammatical forms after “not only” and “but also” are different. It creates a jarring effect for the reader and indicates a lack of grammatical precision.
Example of error: “She enjoys not only reading books but also to watch movies.” The error is connecting a gerund phrase (“reading books”) with an infinitive phrase (“to watch movies”).
Corrected version: “She enjoys not only reading books but also watching movies.” Both are gerund phrases, ensuring parallelism.
Misplaced Conjunctions
When “not only” or “but also” are not placed immediately before the elements they are intended to connect, the meaning can become distorted or unclear.
Example of error: “He not only ate the cake quickly but also left crumbs everywhere.” The “quickly” modifies “ate,” but the placement of “not only” makes it seem like the cake itself was eaten quickly, which is less precise.
A clearer version: “He ate the cake not only quickly but also left crumbs everywhere.” Or, for better emphasis on both actions: “He not only ate the cake quickly but also left crumbs everywhere.” This ensures both actions are highlighted.
Subject-Verb Agreement Errors with Differing Subjects
As discussed, when subjects are different, the verb must agree with the closer subject. Failing to do so is a common mistake.
Example of error: “Not only the players but also the coach were disappointed.” “Coach” is singular and closer to the verb, so the verb should be singular.
Corrected version: “Not only the players but also the coach was disappointed.”
Ignoring the “But Also” Element
Sometimes, writers use “not only” without a corresponding “but also,” or they omit the “but also” part entirely, weakening the intended emphasis on duality.
Example of error: “The plan not only seems feasible.” This sentence is incomplete and lacks the crucial second part of the correlative structure.
Corrected version: “The plan not only seems feasible but also offers significant long-term benefits.” This completes the structure and adds the intended emphasis.
Advanced Usage and Stylistic Considerations
Beyond the basic rules, “not only… but also” can be used in more sophisticated ways to add nuance and emphasis to writing. Its strategic placement can elevate prose from functional to eloquent.
Consider using this construction to introduce surprising or particularly important information in the “but also” clause, creating a sense of progression or heightened impact.
Experimenting with its placement, particularly at the beginning of sentences, can create a more dynamic and engaging rhythm.
Emphasis Through Inversion
As mentioned, starting a sentence with “Not only” often requires inversion (e.g., “Not only did he succeed…”). This stylistic choice adds significant emphasis to the first part of the statement.
Example: “Not only did she master the technical skills, but she also developed exceptional leadership qualities.” The inversion highlights her technical mastery before introducing her equally important leadership abilities.
This grammatical maneuver draws the reader’s attention and signals that something noteworthy is being presented.
Connecting Abstract Concepts
The correlative conjunction is highly effective for linking abstract ideas or concepts, allowing for complex comparisons and contrasts.
Example: “Democracy is not only about the right to vote but also about the protection of minority rights and freedom of expression.” This connects two fundamental aspects of a democratic system.
This usage allows for layered definitions and multifaceted explanations.
Creating a Sense of Progression
The structure inherently suggests a progression, moving from an initial point (“not only”) to a subsequent, often more significant or surprising, point (“but also”).
Example: “The research not only confirmed existing theories but also opened up entirely new avenues of inquiry.” This clearly shows a progression from validation to novel discovery.
This inherent sense of building upon an idea makes it useful for narrative or argumentative development.
Varying Sentence Structure
Strategic use of “not only… but also” can break up monotony in writing, offering a more complex and varied sentence structure compared to simple conjunctions like “and.”
Example: Instead of “He is intelligent and he is kind,” one could write: “He is not only intelligent but also kind.” This adds a touch more emphasis and formality.
Incorporating such structures judiciously can significantly improve the sophistication of one’s writing style.
Practical Applications in Different Contexts
The “not only… but also” construction finds its utility across various forms of communication, from academic writing to everyday conversation. Its ability to convey dual emphasis makes it a versatile tool.
Understanding its application in different scenarios can help in mastering its correct and effective use. Whether in formal essays or casual dialogue, precision is key.
Consider its role in persuasive arguments and descriptive passages alike.
Academic and Formal Writing
In academic papers, essays, and formal reports, “not only… but also” is frequently used to present complex findings or arguments that have multiple facets.
Example: “The study not only demonstrated a correlation between the variables but also provided a potential causal mechanism.” This highlights both the observed relationship and the proposed explanation.
Its use here lends an air of thoroughness and intellectual rigor to the presented information.
Business and Professional Communication
In business contexts, this structure can be employed to emphasize the comprehensive nature of a product, service, or proposal.
Example: “Our new software not only streamlines workflow but also enhances data security.” This highlights two key benefits of the product.
This construction effectively communicates that multiple advantages are being offered, appealing to a broader range of client needs.
Creative Writing and Literature
Authors often use “not only… but also” to add depth to character descriptions, plot development, or thematic exploration, contributing to richer storytelling.
Example: “The character was not only physically imposing but also possessed a gentle, artistic soul.” This creates a more complex and intriguing portrait of the individual.
Such contrasts can add layers of complexity and interest to literary works.
Everyday Conversation
Even in casual conversation, “not only… but also” can be used to emphasize a point or share information that has two significant aspects.
Example: “I’m not only tired from the hike but also starving!” This conveys two immediate needs resulting from the activity.
Its use in spoken language can make communication more dynamic and expressive.
Conclusion: Embracing the Power of Dual Emphasis
Mastering “not only… but also” involves a deep understanding of grammatical parallelism, precise placement, and correct subject-verb agreement.
By internalizing these rules and practicing with varied examples, writers and speakers can confidently employ this powerful correlative conjunction to enhance clarity, add emphasis, and elevate their communication.
The ability to effectively link two related ideas with this structure is a hallmark of sophisticated language use.