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Your classmate wrote this sentence in an essay. Help them fix the grammar mistake! Select the correct option for each blank.
"Learning new languages _________________________ incredibly useful for your career."
Remember: A gerund phrase as a subject is always treated as ONE unit — it takes a singular verb!
The correct answer is is.
"Learning new languages" is a gerund phrase acting as the subject. Even though "languages" is plural, the entire phrase counts as a single unit, so it needs the singular verb "is." ✗ "are" → ✓ "is"