We use hyphens
Adjective/adverb + present participle
- He is a hard-working student
- Mary is really easy-going
Noun + adj / past participle before a noun
- A world-famous athlete
Adverb + noun / past participle before the noun
- She is a really well-liked member of the staff.
- You can buy water from this coin-operated machine.
Superlative adjective + present participle
- Mark is our best-performing athlete
We do not use hyphens
when the adverb / noun + past participle adjective comes after the noun
- The meeting was really well organised.
When a compound phrase starts with an -ly adverb.
- My friend is greatly valued by my classmates.
Three-word compound adjectives after a noun.
- That homework is out of date