The phrase "To Borrow His Shovel" is an example of Infinitive Phrase and it is used as an Adverb.
An infinitive verb becomes an infinitive phrase by adding any complements or modifiers. To make meaning, a phrase needs complementing terms. Infinitive sentences often use direct objects as complements. Modifiers can be used to define or clarify a statement.
A verb, adjective, another adverb, determiner, phrase, preposition, or sentence is frequently modified by an adverb. When answering questions like "how," "in what way," "when," "where," and "to what extent," adverbs are frequently used to express variables like method, place, time, frequency, degree, level of certainty, etc.
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