Using Hyphens.

Knowing when and where to use hyphens is challenging. You use hyphens to form a compound word, join a capital letter to a noun or participle, to write out numbers from twenty-one to twenty-nine, and to join two or more words that serve as a single adjective.

Hyphens are often used to make words beginning with prefixes, such as: self-, ex-, all-, great-, and half-.

Examples of Words That Need Hyphens