hyphen or not?

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uniopp

Member
Joined
Nov 21, 2006
Member Type
Student or Learner
Native Language
Japanese
Home Country
Japan
Current Location
Japan
Which is correct -
a 4-year-old boy
a 4 year old boy
Are there some other cases when we need hyphens?
Thanks
 

albertino

Senior Member
Joined
May 27, 2007
Member Type
Other
Native Language
Chinese
Home Country
Hong Kong
Current Location
Hong Kong
Which is correct -
a 4-year-old boy
a 4 year old boy
Are there some other cases when we need hyphens?
Thanks
(Not a teacher)
It is another pattern to express "He is a boy of 4 years old".
The first is preferable, as "4 years old" is put before the noun as an adjectival phrase.

The second question is a BIG one, you'd better raise it with a new thread.
 
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