Hyphens, En dashes, Em dashes
Use a hyphen for certain compound adjectives that precede the modified noun.
examples: well-supported hypotheses
In general, do not use the hyphen if the compound adjective comes after the modified noun.
example: The hypothesis was well supported.
Do not use the hyphen when the first word in the compound adjective is an adverb ending in ly.
examples: evenly spaced samples
moderately buffered solutions
Use an en dash for ranges.
examples: pages 55–60
Also use an en dash for compound adjectives if the adjectives are of equal weight.
example: the oak–pine forest
Use an em dash for parenthetical information or to indicate a sudden break in thought.
example: The forest—the largest in North America—was thriving.
insert an en dash or em dash in Microsoft Word, go to Insert, Symbol, Special
Characters (in pull down menu).
To insert an en dash or em dash in Microsoft Word, go to Insert, Symbol, Special Characters (in pull down menu).