How is an infinitive typically formed?

• A. With a conjunction
• B. By adding -ed to the verb
• C. As the base form of a verb often preceded by "to"
• D. As the -ing form of a verb

Answer: (C)

An infinitive is typically formed as the base form of a verb often preceded by "to." This structure is fundamental in English grammar and is used to express various actions or states in a non-finite form. For example, in the phrase "to run," "run" is the base form of the verb, and "to" indicates that it is an infinitive. Infinitives can function in sentences as nouns, adjectives, or adverbs, making them versatile components in expressing intention, purpose, or desire. The presence of "to" is essential in this formation because it distinguishes the infinitive from other forms of the verb, such as gerunds or participles.