- tallest: Prefix: (none), Suffix: -est, Root Word: tall
- younger: Prefix: (none), Suffix: -er, Root Word: young
- become: Prefix: (none), Suffix: (none), Root Word: become
- unhappy: Prefix: un-, Suffix: (none), Root Word: happy
- preschool: Prefix: pre-, Suffix: (none), Root Word: school
- disappear: Prefix: dis-, Suffix: (none), Root Word: appear
- underground: Prefix: under-, Suffix: (none), Root Word: ground
- misspoke: Prefix: mis-, Suffix: (none), Root Word: spoke
- ungrateful: Prefix: un-, Suffix: (none), Root Word: grateful
- replay: Prefix: re-, Suffix: (none), Root Word: play
- worthless: Prefix: (none), Suffix: -less, Root Word: worth
Parent Tip: Review the logic above to help your child master the concept of root words 4th grade language arts worksheet.