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Hyphen
A hyphen is used to join two words that work together.
To Join Compound Nouns and Adjectives
Athens and Sparta were city-states.
I got a first-place trophy!
Some compound adjectives include many words.
I am a soon-to-be superstar, not just a run-of-the-mill third grader.
In Fractions
Use a hyphen between the numbers in fractions written as words.
We watched two-thirds of the episode before bedtime.