English worksheet teaching the prefix "un" to form opposites, with exercises on word formation, matching, and sentence writing.

Worksheet titled "Prefixes: un.... (1)" from URBrainy.com, featuring a turtle character and instructions to add "un" to words like "do," "fit," "lock," and "lit" to create new words. Includes a matching exercise with words like "uneven," "untidy," "untrue," "unsafe," "risky," "messy," "not level," and "false," and a sentence writing section with the words "undo," "untidy," and "unfit."