Grammar Clinic: The REAL difference between YEAR-OLD and YEARS OLD
If you use a noun as an adjective, it must be singular You can say, “She is ten years old.” But if you use that phrase as an adjective, it becomes, “She is a ten-year-old girl.” The ceiling is ten feet high. The room has a ten-foot ceiling. My 16-year-old sister is so brilliant. A […]
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