Building words with prefixes and suffixes: happy → happiness → unhappy
Base word + suffix OR prefix + base word
un-, in-, im-, dis-, mis- + base word
N/A
💡 Suffixes often change word class. Prefixes often change meaning but keep word class.
✓The development of the project took months.
✗The developement of the project took months.
Develop + -ment = development (no 'e' before -ment).
✓His behavior was completely unacceptable.
✗His behavior was completely inacceptable.
Accept → unacceptable (un- prefix, not in-).
✓She spoke very quietly.
✗She spoke very quietely.
Quiet + -ly = quietly (no 'e' added).