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Your study buddy wrote some sentences for homework. Help them out! Select ALL the sentences that contain a subject-verb agreement error with a gerund phrase.
The correct answers are Learning new languages are challenging but rewarding and Eating vegetables every day are good for your health.
A gerund phrase as subject is treated as a singular unit, so it takes a singular verb. "Learning new languages is challenging" and "Eating vegetables every day is good" are the correct forms. The verb must agree with the gerund phrase, not with the noun inside it.