Splitting Infinitives (to boldly go)
Grammar Rule in 30 Seconds
A split infinitive occurs when you place an adverb between the particle 'to' and the base verb for emphasis or clarity.
- Standard: 'to' + 'verb' (to go). Split: 'to' + 'adverb' + 'verb' (to boldly go).
- Use it to avoid ambiguity: 'to quickly leave' is clearer than 'quickly to leave'.
- Modern style allows it, but some formal academic circles still prefer avoiding it.
Overview
You can put a word between to and an action word. This makes your meaning clear. It is okay to do this.
Long ago, people said this was a mistake. They used rules for a different language. But English is different.
Use this way of speaking to be clear. It helps you say exactly what you mean.
You will learn to use this well. It makes your English sound very good.
How This Grammar Works
Formation Pattern
When To Use It
- 1For Unambiguous Clarity: This is perhaps the most compelling reason to employ a split infinitive. When an adverb could plausibly modify different parts of a sentence depending on its placement, splitting the infinitive ensures it unambiguously modifies the verb within the infinitive. Consider the sentence:
He decided to quietly discuss the matter.Here,quietlyclearly modifiesdiscuss, indicating the manner of discussion. If placed elsewhere, ambiguity can arise:He decided quietly to discuss the matter.Doesquietlydescribe how he decided or how he would discuss? The split eliminates this potential for misinterpretation, making the sentence immediately clear. You employ this when the precise scope of adverbial modification is paramount, as in legal texts or scientific reports where exactitude is critical.
- 1For Enhanced Emphasis and Impact: Placing an adverb directly before the verb it modifies within an infinitive creates a strong, immediate connection, lending emphasis to that modification. This positioning can make the adverbial force more pronounced and impactful. Compare
We want to achieve success quicklywithWe want to quickly achieve success.In the latter,quicklyis front-loaded ontoachieve, highlighting the urgency and speed of the desired action more directly. The listener or reader immediately grasps the crucial qualifier for the verb. This technique is particularly effective in persuasive writing, speeches, or any context where you aim to impress a specific quality of an action upon your audience. It helps to foreground the adverb, drawing immediate attention to its significance.
- 1To Maintain Natural Rhythm and Flow (Avoiding Awkwardness): English often favors placing heavier or more complex syntactic elements towards the end of a clause or sentence (the principle of end-weight). However, when an adverb is closely tied to the verb's meaning, separating them can create a less natural, even stilted, sound. Attempting to avoid a split infinitive can sometimes force an adverb into an unnatural position, disrupting the sentence's rhythm. For example,
I promised to explain thoroughly the complex proceduresounds less fluid thanI promised to thoroughly explain the complex procedure.The split allows for a more natural phonetic and cognitive processing, asthoroughly explainforms a tighter conceptual unit. Your ear, finely tuned to native English cadence at C2, becomes a reliable guide here. If moving the adverb outside the infinitive creates an awkward pause or an unnatural separation of closely related ideas, the split is often the superior choice. This is not about grammatical rule-breaking, but about optimizing the sentence's internal musicality and ease of comprehension.
- 1With Long or Complex Verbs/Objects: In sentences where the infinitive verb phrase itself is lengthy or followed by a long object, splitting the infinitive can prevent the adverb from becoming detached or confusingly associated with later elements. For instance,
They decided to meticulously prepare the intricate, multi-stage presentation for the board of directors.Placingmeticulouslyafterprepare(to prepare meticulously the intricate...) would place a short adverb before a long, complex object, often sounding less balanced. The split helps to 'anchor' the adverb to its verb before the sentence expands. This application demonstrates a sophisticated awareness of sentence structure and cognitive load, strategically positioning information for optimal reader processing. It often aligns with the aforementioned principle of end-weight, allowing the more complex elements to resolve at the sentence's conclusion while the core action is modified immediately.
Common Mistakes
- 1Over-splitting or Unnecessary Splitting: Just because you can split an infinitive does not mean you should always do so. A common error is splitting an infinitive when the adverb functions perfectly well and perhaps even more elegantly in another position, particularly at the end of the clause. For instance,
He wants to quickly finish his assignmentis acceptable, butHe wants to finish his assignment quicklyis often equally, if not more, natural and less emphatic onquickly. The split here adds a subtle emphasis that might not be intended or necessary. Overusing splits can make your writing feel contrived or draw undue attention to the adverb, disrupting the natural flow. Evaluate whether the split truly enhances clarity or emphasis, or if it merely adds an adverb where it could comfortably sit elsewhere.
- 1Splitting with Non-Adverbial Elements: The split infinitive is specifically for adverbs or very short adverbial phrases. An error occurs when other parts of speech, such as nouns, pronouns, or conjunctions, are mistakenly inserted between
toand the verb. For example,He tried to him convinceis grammatically incorrect becausehimis a pronoun, not an adverb. Similarly,They asked to a new approach implementis erroneous. The inserted element must function grammatically as a modifier of the verb. Always confirm that the word you are placing in the split is indeed an adverb or an adverbial phrase that answers how, when, where, or to what extent the action of the verb is performed.
- 1Creating New Awkwardness or Obscurity: While a primary benefit of the split infinitive is to avoid awkwardness or ambiguity, an improperly constructed split can inadvertently create new problems. This often happens with overly long or complex adverbial insertions, or when the split separates the
toand the verb too far. Consider:She hoped to, with great dedication and persistent effort, achieve her goals.Here, the long adverbial phrasewith great dedication and persistent effortmakes the split clumsy and difficult to read. The very purpose of the split (clarity, flow) is undermined. In such cases, rephrasing to place the adverbial phrase either before the infinitive (With great dedication and persistent effort, she hoped to achieve her goals.) or after the entire verb phrase (She hoped to achieve her goals with great dedication and persistent effort.) would be superior. The goal is always enhancement, not mere placement.
- 1Misunderstanding the Degree of Formality: Some learners, aware of the historical controversy, might avoid split infinitives even in contexts where they are perfectly acceptable and even preferred. Conversely, some might use them indiscriminately, believing the 'rule' has been entirely abolished without nuance. The mistake lies in not adjusting usage to the audience and purpose. While generally accepted in modern English across most registers, extremely conservative academic or formal publications might still exhibit a preference for avoiding them. A C2 learner understands that linguistic choices, including the use of split infinitives, are part of a broader stylistic consideration, not just a matter of binary correctness.
Real Conversations
Split infinitives are not confined to formal writing or academic papers; they are pervasive in authentic, modern English across various registers. Observing their natural occurrence in everyday dialogue, professional communications, and media reinforces their acceptance and utility.
- Academic Discussion (Online Forum): "I find it much easier to fully grasp complex theories when they are presented with practical examples. We need to actively encourage more interdisciplinary dialogue on this platform." (Here, fully grasp emphasizes the completeness of understanding, and actively encourage highlights the proactive nature of encouragement.)
- Professional Email: "Regarding the project timeline, we aim to significantly accelerate the development phase next quarter. I will try to personally ensure all team members are aligned with the new objectives." (significantly accelerate adds weight to the speed increase; personally ensure underscores direct involvement.)
- Casual Conversation (Text Message): "I managed to finally meet Sarah for coffee yesterday! We had to really catch up on everything." (finally meet conveys the long-awaited nature of the meeting; really catch up intensifies the act of catching up.)
- Podcast Interview: "The director explained how they worked to subtly weave environmental themes into the narrative without making it overtly preachy. They wanted to clearly show the impact of human actions." (subtly weave highlights the delicate integration; clearly show emphasizes the explicit demonstration.)
- News Report (Voiceover): "Authorities are working to effectively mitigate the economic impact of the new regulations. They are attempting to gradually introduce the changes over the next six months." (effectively mitigate focuses on the successful reduction of impact; gradually introduce specifies the paced implementation.)
- Technical Documentation: "Users are advised to carefully follow the installation instructions to correctly configure the software. Failure to precisely execute these steps may lead to system instability." (carefully follow, correctly configure, precisely execute all stress the exactness and attention required for the actions.)
These examples illustrate that split infinitives are integrated seamlessly into the English language, serving various purposes from emphasizing urgency to ensuring clarity of instruction. Their use often goes unnoticed precisely because they sound natural and convey meaning efficiently.
Quick FAQ
Is it okay to use this today?
Yes, it is okay. It helps people understand you. Use it to sound natural.
Can putting a word between 'to' and an action change meaning?
Yes. It makes one word more important. It makes what you say clear.
Should I ever stop putting words between 'to' and actions?
Some old books say no. Most people do it now. It is okay if it helps. You can decide.
Can I put more than one word there?
You can use two small words. Long groups of words look bad. They are hard to read. Keep it short.
Why did people fight about this for a long time?
Long ago, teachers used rules from another language. That language used one word for actions. English uses two words like 'to walk'. You can put words between them. The old rule was a mistake.
Why is putting a word after 'to' good for a top student?
It helps you say exactly what you mean. You can show what is important. It helps you speak well.
Infinitive Placement Comparison
| Type | Structure | Example | Effect |
|---|---|---|---|
|
Standard
|
to + verb + adverb
|
To go boldly
|
Neutral/Traditional
|
|
Split
|
to + adverb + verb
|
To boldly go
|
Emphatic/Rhythmic
|
|
Negative Standard
|
not + to + verb
|
Not to fail
|
Formal/Standard
|
|
Negative Split
|
to + not + verb
|
To not fail
|
Conversational/Strong
|
|
Compound Split
|
to + adv + and + adv + verb
|
To fully and clearly see
|
Highly Descriptive
|
Meanings
The practice of placing a word or phrase (usually an adverb) between 'to' and the bare infinitive form of a verb.
Emphasis
Using the split to draw specific attention to the manner of the action.
“I want you to really think about this.”
“She needs to actually try for once.”
Clarity/Ambiguity Avoidance
Splitting the infinitive to ensure the adverb modifies the correct verb in a complex sentence.
“He agreed to immediately help us (He will help now).”
“He agreed immediately to help us (The agreement happened now).”
Negative Splitting
Placing 'not' between 'to' and the verb for stylistic weight.
“The challenge is to not fail.”
“I was told to not worry.”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative Split
|
to [adverb] [verb]
|
to carefully listen
|
|
Negative Split
|
to not [verb]
|
to not care
|
|
Passive Split
|
to [adverb] be [past participle]
|
to successfully be hired
|
|
Interrogative
|
Do you want to [adverb] [verb]?
|
Do you want to really try?
|
|
Modal + Split
|
ought to [adverb] [verb]
|
ought to seriously consider
|
|
Complex Adverb
|
to [adverbial phrase] [verb]
|
to more than double
|
Formality Spectrum
To understand the situation fully (General comprehension)
To fully understand the situation (General comprehension)
To really get what's going on (General comprehension)
To lowkey get the vibe (General comprehension)
The Split Infinitive Structure
Components
- to particle
- adverb modifier
- base verb action
Reasons to Use
- Clarity Avoid confusion
- Emphasis Highlight manner
- Rhythm Better flow
Split vs. Non-Split Ambiguity
Examples by Level
I want to really help you.
Try to slowly speak.
He needs to quickly run.
I like to always win.
You need to carefully open the box.
She decided to never go back.
We hope to soon see you.
It is hard to perfectly cook rice.
The manager asked us to seriously consider the offer.
I was told to not touch the buttons.
They want to significantly improve the software.
He tried to quietly enter the room.
The government plans to further investigate the matter.
It is essential to properly maintain your vehicle.
She was able to successfully complete the marathon.
We need to effectively communicate our goals.
The witness was asked to truthfully and accurately recount the events.
The author tends to deliberately obscure the protagonist's motives.
The company sought to aggressively expand its market share.
It is a mistake to simply assume that the data is correct.
The diplomat's task was to subtly yet firmly convey the administration's displeasure.
To truly understand the poem, one must look beyond the literal meaning.
The board decided to irrevocably and unconditionally terminate the contract.
He was determined to not only survive but to actually thrive in the new environment.
Easily Confused
Learners often place adverbs in positions where they could modify the preceding or following verb.
Common Mistakes
I want to really to go.
I want to really go.
To go really.
To really go.
He decided to not to eat.
He decided to not eat.
I hope to quickly and without any trouble finish.
I hope to finish quickly and without any trouble.
He failed to completely and utterly and without reservation apologize.
He failed to apologize completely, utterly, and without reservation.
Sentence Patterns
It is important to ___ ___.
The goal is to ___ and ___ ___.
Real World Usage
I hope to significantly contribute to your team.
I need to literally go right now.
The study aims to better understand the underlying causes.
The parties agree to mutually terminate the agreement.
I'm about to finally post the vlog!
Be sure to thoroughly whisk the eggs.
The 'Not' Split
Avoid the 'Wedge'
Read it Aloud
Know your Audience
Smart Tips
Try splitting the infinitive to see if it adds more 'punch' to your sentence.
Switch to 'to not' for a more modern, conversational feel.
Split the infinitive to ensure the adverb only modifies the action verb.
Do NOT split. Move the long phrase to the end of the sentence.
Pronunciation
Stress the Adverb
When splitting an infinitive, the stress usually falls on the adverb to highlight the manner of the action.
Rising-Falling
to BOLDly go
Conveys confidence and emphasis.
Memorize It
Mnemonic
Remember 'Star Trek': To BOLDLY go. If Captain Kirk can do it, you can too!
Visual Association
Imagine a giant wedge (the adverb) being driven between the words 'to' and 'verb'. The wedge makes the whole structure stronger and more visible.
Rhyme
When 'to' and 'verb' are split apart, the adverb speaks from the heart.
Story
A grammarian in 1860 tried to glue 'to' and 'run' together with Latin glue. But the English language was too strong; it popped an 'adverb' right in the middle to show everyone how it's done.
Word Web
Challenge
Write three sentences about your career goals using split infinitives (e.g., 'I want to significantly increase...').
Cultural Notes
Americans are generally very comfortable with split infinitives, especially in media and business.
Some older British style guides (and older generations) may still view it as a sign of 'lazy' writing, though this is changing rapidly.
The phrase 'To boldly go' from Star Trek is the most famous split infinitive in history and is often used to defend the construction.
The 'rule' against split infinitives was popularized by Henry Alford in 1864, who based it on Latin grammar.
Conversation Starters
What is one thing you want to completely change about your routine?
In your opinion, is it better to slowly build a career or to quickly reach the top?
Journal Prompts
Common Mistakes
Test Yourself
The company needs...
If you want to win, you need ___.
Find and fix the mistake:
He decided quickly to leave the party.
I decided ___.
Splitting an infinitive is a grammatical error in modern English.
Identify the split infinitive:
A: Should I tell him the truth? B: I think you need ___.
It is easy ___.
Score: /8
Practice Exercises
8 exercisesThe company needs...
If you want to win, you need ___.
Find and fix the mistake:
He decided quickly to leave the party.
I decided ___.
Splitting an infinitive is a grammatical error in modern English.
Identify the split infinitive:
A: Should I tell him the truth? B: I think you need ___.
It is easy ___.
Score: /8
Practice Bank
12 exercisesIt's important ___ remember your roots.
The company decided ___ restructure its global operations.
I need to ensure thoroughly that all safety protocols are followed.
She resolved to, after much deliberation, resign from her position.
Choose the correct sentence:
Choose the correct sentence:
Translate into English: 'El objetivo es mejorar drásticamente la calidad.'
Translate into English: 'Ella comenzó a estudiar seriamente para sus exámenes.'
Arrange these words into a sentence:
Arrange these words into a sentence:
Match the infinitive phrase beginnings with their appropriate split adverbs.
Match the split infinitive on the left with an equivalent or closest unsplit version on the right.
Score: /12
FAQ (8)
Only if it makes the sentence confusing or ugly. If you put a 10-word phrase between 'to' and the verb, it's 'wrong' stylistically, but not grammatically.
Many teachers still follow 19th-century rules based on Latin. In Latin, you can't split an infinitive because it's one word. English is different!
Yes, but 'to not' is often more emphatic. 'I chose not to go' is neutral. 'I chose to not go' sounds like a stronger decision.
Yes. Most modern academic journals and style guides (like MLA or Chicago) allow it for the sake of clarity.
It's an adverb that sits between two verbs, making it unclear which one it modifies. Splitting the infinitive solves this by 'locking' the adverb to the second verb.
Yes, e.g., 'to fully and completely understand'. Just don't overdo it, or the sentence will become hard to follow.
You can say 'to clearly be' or 'to be clearly'. Both are common, but 'to clearly be' is the split form.
The Star Trek intro: 'To boldly go where no man has gone before.'
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Infinitive + Adverb
English infinitives are two words; Spanish are one.
Infinitive + Adverb
French cannot split the verb unit.
Adverb + zu + Infinitive
German puts the adverb before the 'to' equivalent.
Adverb + Verb-form
No particle-verb structure to split.
Masdar (Verbal Noun)
Arabic uses noun-based or clause-based structures.
Adverb + Verb
No 'to' particle exists to be split from the verb.
Learning Path
Prerequisites
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