In the sentence "The author's purpose is to inform the reader about Gustav Zander," the phrase "to inform the reader" is...

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an infinitive phrase.
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an appositive phrase.
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a prepositional phrase.
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a participial phrase.
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1 answer

The phrase "to inform the reader" is an infinitive phrase. An infinitive phrase typically begins with "to" followed by the base form of a verb, and in this case, "to inform" is the infinitive.