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Split infinitive

English grammatical construction

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Through Credits and William Shakespeare

Split infinitives have long been deprecated as incorrect, or at least avoidable, despite their frequent use in the vernacular. Since the 19th century linguistic prescriptivists have sought to categorically disallow split infinitives, but recent editions of English usage guides have largely dropped their objection.

History of the construction

Old and Middle English

In Old English, infinitives were single words ending in -n or -an (comparable to modern Dutch and German -n, -en). Gerunds were formed using to followed by a verbal noun in the dative case, which ended in -anne or -enne (e.g., tō cumenne = "coming, to come"). In Middle English, the bare infinitive and the gerund coalesced into the same form ending in -(e)n (e.g., comen "come"; to comen "to come"). The "to" infinitive was not split in Old or Early Middle English.

The first known example of a split infinitive in English, in which a pronoun rather than an adverb splits the infinitive, is in Layamon's Brut (early 13th century):

and he cleopede him to; alle his wise cnihtes.
for to him reade;
And he called to him all his wise knights
to him advise;

This may be a poetic inversion for the sake of meter, and therefore says little about whether Layamon would have felt the construction to be syntactically natural. However, no such reservation applies to the following prose example from John Wycliffe (14th century), who often split infinitives:

For this was gret unkyndenesse, to this manere treten there brother.
For this was great unkindness, to in this manner treat their brother.

Modern English

After its rise in Middle English, the construction became rare in the 15th and 16th centuries. William Shakespeare used it at least once. The uncontroversial example appears to be a syntactical inversion for the sake of meter:

Root pity in thy heart, that when it grows
Thy pity may deserve to pitied be (Sonnet 142).

Edmund Spenser, John Dryden, Alexander Pope, and the King James Version of the Bible used none, and they are very rare in the writing of Samuel Johnson. John Donne used them several times, though, and Samuel Pepys also used at least one. No reason for the near disappearance of the split infinitive is known; in particular, no prohibition is recorded.

Split infinitives reappeared in the 18th century and became more common in the 19th. Daniel Defoe, Benjamin Franklin, William Wordsworth, Abraham Lincoln, George Eliot, Henry James, and Willa Cather are among the writers who used them. Examples in the poems of Robert Burns attest its presence also in 18th-century Scots:

Who dared to nobly stem tyrannic pride. ("The Cottar's Saturday Night")

In colloquial speech, the construction came to enjoy widespread use. Today, according to the American Heritage Book of English Usage, "people split infinitives all the time without giving it a thought." In corpora of contemporary spoken English, some adverbs such as always and completely appear more often in the split position than the unsplit.

Theories of origins

Although it is difficult to say why the construction developed in Middle English, or why it revived so powerfully in Modern English, a number of theories have been postulated.

Analogy

Traditional grammarians have suggested that the construction appeared because people frequently place adverbs before finite verbs. George Curme writes: "If the adverb should immediately precede the finite verb, we feel that it should immediately precede also the infinitive ..." Thus, if one says:

She gradually got rid of her stutter. and
She will gradually get rid of her stutter.

one may, by analogy, wish to say:

She wants to gradually get rid of her stutter.

This is supported by the fact that split infinitives are often used as echoes, as in the following exchange, in which the riposte parodies the slightly odd collocation in the original sentence:

Child: I accidentally forgot to feed the hamster.
Parent: Well, you'll have to try harder not to "accidentally forget", won't you?

This is an example of an adverb being transferred into split infinitive position from a parallel position in a different construction.

Transformational grammar

Transformational grammarians have attributed the construction to a re-analysis of the role of to.

Types

In the modern language, splitting usually involves a single adverb coming between the verb and its marker. Very frequently, this is an emphatic adverb, for example:

I need you all to really pull your weight.
I'm gonna (going to) totally pulverise him.

Sometimes it is a negation, as in the self-referential joke:

Writers should learn to not split infinitives.

However, in modern colloquial English, almost any adverb may be found in this syntactic position, especially when the adverb and the verb form a close syntactic unit (really-pull, not-split).

Compound split infinitives, i.e., infinitives split by more than one word, usually involve a pair of adverbs or a multi-word adverbial:

We are determined to completely and utterly eradicate the disease.
He is thought to almost never have made such a gesture before.
This is a great opportunity to once again communicate our basic message.

Examples of non-adverbial elements participating in the split-infinitive construction seem rarer in Modern English than in Middle English. The pronoun all commonly appears in this position:

It was their nature to all hurt one another.

and may even be combined with an adverb:

I need you to all really pull your weight.

However an object pronoun, as in the Layamon example above, would be unusual in modern English, perhaps because this might cause a listener to misunderstand the to as a preposition:

*And he called to him all his wise knights to him advise.

While, structurally, acceptable as poetic formulation, this would result in a garden path sentence, particularly evident if the indirect object is omitted:

Other parts of speech would be very unusual in this position. However, in verse, poetic inversion for the sake of meter or of bringing a rhyme word to the end of a line often results in abnormal syntax, as with Shakespeare's split infinitive (to pitied be, cited above), in fact an inverted passive construction in which the infinitive is split by a past participle. Presumably, this would not have occurred in a prose text by the same author.

When multiple infinitives are linked by a conjunction, the particle to tends to be used only once at the beginning of the sequence: to eat, drink, and be merry. In this case, the conjunction and any other words that fall between the to and the final infinitive have seldom been deemed to create a split infinitive, and almost always have been considered uncontroversial. Examples include "We pray you to proceed / And justly and religiously unfold ..." (Shakespeare, Henry V, Act II, scene 9) and "... she is determined to be independent, and not live with aunt Pullet" (George Eliot, The Mill on the Floss, volume VI, chapter I).

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