Identify the gerund phrase and identify the noun function of the gerund. Brett earn his income by repairing cars
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The gerund phrase in the sentence is "repairing cars."
To identify the noun function of the gerund, we need to determine how the gerund phrase is used in the sentence. In this case, the gerund phrase "repairing cars" is used as the object of the preposition "by." It tells us how Brett earns his income. Therefore, the noun function of the gerund is that it acts as the object of the preposition.