Read the sentence. Much to the delight of the students, the faculty decided to enrich the curriculum by adding art to Tuesday mornings and music to Thursday afternoons. Which part of the sentence contains an infinitive?

An infinitive is the word “to” followed by a verb in its base form. In “to enrich,” enrich is a verb, so this is the infinitive. In the other choices, “to” is a preposition followed by a noun or noun phrase.

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