An infinitive is 'to muse,' functioning as part of the verb phrase 'to muse over.'
An infinitive is a verb form that usually begins with 'to' and functions as a noun, adjective, or adverb in a sentence. In the given sentence, the infinitive is 'to muse' as it serves as part of the verb phrase 'to muse over,' indicating the purpose of why the teenagers went to town.
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