1

"This is a difficult problem for a fifteen-year-old boy."

My guess is that "fifteen-year-old" forms an adjective, but I'm not really sure.

Thank you in advance for your help.

1

In your sentence

fifteen-year-old boy

is used as an adjective for boy

In the case of

He is a fifteen-year-old.

it is used as a compound noun.

in contrast to

He is fifteen years old

to say how many years he has been alive.

  • Thank you very much. You make me feel I'm on the right track. – Rafiq Mar 9 '16 at 14:54
  • It's a twelve-inch-long ruler. It's a seven-day course of antibiotic. – Tᴚoɯɐuo Mar 9 '16 at 15:04
0

http://www.grammar.cl/english/compound-adjectives.htm Compound adjectives are written with hypen, and nouns after numbers don't get a plural-s.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.