This lesson explores how prefixes can create words that don’t appear in the dictionary, yet still follow predictable grammar rules. Students will learn how common prefixes—such as un‑, re‑, mis‑, and pre‑—modify base words to form new, meaningful terms, even when those combinations aren’t officially recognized entries. By understanding how prefixes work, students gain the confidence to decode unfamiliar words, build vocabulary creatively, and recognize how English allows flexible word formation through its structure.