Final answer:
The infinitive phrase in the sentence 'Zoe was glad to finish mowing the yard' is 'to finish mowing the yard,' expressing her purpose. Infinitive phrases contain the infinitive form of a verb and associated modifiers or objects.
Explanation:
Infinitive phrase: To finish mowing the yard
In the sentence, the infinitive phrase is to finish mowing the yard. An infinitive phrase begins with the infinitive form of a verb (in this case, to finish) and includes objects or modifiers.
Infinitive phrases are commonly used to express purpose or intention in a sentence, and they are non-finite verbs that cannot function as the main verb.
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