Hyphenation RulesSet 3
Frequently Asked Questions
How do you apply hyphenation rules for compound modifiers?
Hyphenation rules for compound modifiers require hyphens when the modifiers precede a noun and act as a single unit. For example, "well-known author" uses a hyphen because "well-known" modifies "author" as a single concept.
What is the correct hyphenation in compound numbers?
Compound numbers from twenty-one to ninety-nine are hyphenated, such as "thirty-five." Numbers above one hundred are typically not hyphenated unless they include a compound number, like "one hundred twenty-five."
When should hyphens be used with prefixes?
Hyphens are used with prefixes when the prefix is followed by a proper noun or when the combination might be confusing or difficult to read, such as "ex-president" or "anti-inflammatory."
How do you use hyphens in compound units of measurement?
Hyphens are used in compound units of measurement when they precede a noun, such as "kilometer-per-hour speed." When the unit follows the noun, no hyphen is needed, as in "speed of 60 kilometers per hour."
What are the hyphenation rules for adverbs ending in -ly?
Adverbs ending in -ly are not hyphenated when they modify adjectives or other adverbs, such as "quickly moving car." Hyphens are used only when the adverb is part of a compound modifier preceding a noun, like "well-known actor."