This Grade 4 hard worksheet introduces common prefixes and suffixes including un-, re-, dis-, pre-, -ful, -less, and -ly. Students answer four multiple-choice questions and complete five fill-in sentences using built words like unhappy, redo, joyful, and dislike. Detailed explanations show how prefixes and suffixes attach to base words without changing letters. Fourth graders practice combining word parts to expand vocabulary and spelling skills.