Hyphens are used to form a compound word. A compound word is the joining of two separate words to form one concept. Hyphens should be used when there is a compound adjective directly before the noun that it describes. There are other times in which a hyphen is needed such as brother-in-law or other family members that follow that example. Many two-digit numbers also require the use of a hyphen, such as twenty-four. Any words including self or ex should also be hyphenated.
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Last updated: 12/15/2017
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