Kcsbrown.ss3.sharpschool.com

Use hyphens if the adjectival phrase precedes the noun. 15-year-old boy not 15 year old boy. 13-year-olds not 13 year olds Do not use hyphens when the phrase stands alone. The patient, who is 15 years old…. not 15-years-old. Use a hyphen in a phrase in which the noun following the phrase is implied, or in a phrase that is serving as a noun. ................
................