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What Is a Split Infinitive?

Nicole Madison
Updated May 23, 2024
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A split infinitive is a type of language construction common in English that consists of a phrase that begins with the word "to" and ends with a verb in its uninflected form but has an adverb in between. For example, the phrase "to boldly speak" is a split infinitive. Many people consider splitting infinitives a grammar mistake, but this assertion is controversial. Often, grammar books and style guides are silent on the rule or state that it is better to avoid splitting infinitives if possible, but do not specifically state that it is incorrect, and according to some grammar experts, there is no valid rule against it.

When you want to understand what a split infinitive is, it helps to start with being able to recognize infinitives. An infinitive is a verb construction that starts with the word "to" and ends with a verb in its most simple form. Some examples of infinitives include such phrases as "to run," "to love," "to see," "to speak," and "to eat." If the verb is in another form, however, it cannot be a part of an infinitive, as it is incorrect to say or write "to eating" or "to going." A split infinitive is created by inserting an adverb between the word "to" and the uninflected verb.

Sometimes, a person may choose to split an infinitive by inserting another word between the "to" and the verb. This is typically done to make the infinitive more descriptive. For instance, a person may want to say "to go" but also add in the word "boldly," such as in "to boldly go." Adding in the adverb can significantly change the effect of the phrase. For example, "to quickly eat" has a different meaning from "to eat." Often, editors and teachers who consider split infinitives poor grammar constructions prefer to have the adverb tacked on to the end of the phrase instead, such as in "to eat quickly" rather that "to quickly eat."

Though there many sources that state there are no hard-and-fast rules against split infinitives, there are also many grammar experts, teachers, and editors who consider them incorrect, or at the very least, poor choices. For this reason, an individual may do well to avoid them in formal types of writing. Additionally, it is often best to keep the split infinitives simple, such as "to quickly read" rather than "to quickly and cheerfully read."

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Nicole Madison
By Nicole Madison
Nicole Madison's love for learning inspires her work as a Language & Humanities writer, where she focuses on topics like homeschooling, parenting, health, science, and business. Her passion for knowledge is evident in the well-researched and informative articles she authors. As a mother of four, Nicole balances work with quality family time activities such as reading, camping, and beach trips.
Discussion Comments
By Reminiscence — On Apr 02, 2014

@Buster29- The last time I was in an English grammar class, the instructor told us he wasn't a stickler about the use of split infinitives. He said it was an arbitrary grammar rule in the first place, along with the rule against ending sentences with a preposition. I still try not to split infinitives in my own writing, but I don't go back and correct it if I do.

By Buster29 — On Apr 02, 2014

I think the most glaring example of a split infinitive on television is from the famous opening lines of Star Trek: "To boldly go where no man has gone before." I remember when the show first aired, one of my English teachers had a fit over the split infinitive. She insisted Captain Kirk should have said "to go boldly when no man has gone before."

Personally, I think most split infinitives sound better than the so-called correct versions. I have no problem with "to boldly go" or "to silently weep". I still get the meaning of the sentence, and I think it sounds less awkward sometimes.

Nicole Madison
Nicole Madison
Nicole Madison's love for learning inspires her work as a Language & Humanities writer, where she focuses on topics like...
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