A prefix is a letter or group of letters added to the beginning of a base word. A prefix changes the meaning of a word.
| Prefix | dis | im | re | re | un | un |
| Meaning | not | not | again | back | not | opposite of |
| Example | dislike | impossible | redo | repay | unlucky | unwrap |
My pet goldfish looks unhappy.
I dislike eating ice cream.
I love to unwrap gifts.
My pet goldfish is happy.
I like eating ice cream.
I love to wrap gifts.