Short Answer 
A split infinitive occurs when “to” and a verb are interrupted by other words, often adverbs, which can enhance emphasis or rhythm in a sentence. To identify them, look for adverbs or phrases between “to” and the verb, and while they’re often frowned upon by traditionalists, split infinitives are increasingly accepted in modern writing if they improve clarity and style.
Step 1: Understand Split Infinitives
A split infinitive occurs when the words “to” and a verb are interrupted by other words, often adverbs. This structure can create emphasis or change the rhythm of a sentence. Understanding this concept helps in identifying instances of split infinitives in sentences.
Step 2: Identify Examples of Split Infinitives
To recognize split infinitives in sentences, look for the following structure where an adverb or phrase separates “to” from the verb:
- “to completely ignore”
- “to quickly set”
Both of these constructions illustrate how the adverb disrupts the infinitive phrase. Checking for this separation is key to identifying split infinitives.
Step 3: Consider Usage and Context
While some language purists may frown upon split infinitives, they have become more accepted in modern writing for stylistic reasons. It is essential to use them only when necessary and when they enhance clarity and readability:
- Evaluate the writer’s preference.
- Assess the sentence’s overall context.
Ultimately, the decision to split an infinitive should align with the intended meaning and flow of the sentence.