Compound adjectives formed with adverbs not ending in ‑ly are hyphenated when they are before the noun.
- He is a well-known singer in his country.
(compound adjective/well-known – noun/singer) - The fast-changing situation.
(compound adjective/fast-changing – noun/situation)
If the compound adjectives formed with adverbs are after the noun, they are not hyphenated.
- A singer that is well known in his country.
(noun/singer – compound adjective/well known) - The situation is fast changing.
(noun/situation – compound adjective/fast changing)
Now try the English Punctuation Quiz.