Here are some examples of prefixes:
* un-: undo, unhappy, unbreakable
* re-: rewrite, redo, reread
* pre-: pre-game, pre-order, pre-existing
* mis-: misunderstand, misbehave, misinterpret
* dis-: disagree, disappear, disconnect
Prefixes can change the meaning of a word in various ways, such as making it negative, indicating a repetition, or changing its direction.