1. pre-: before (pre-game, pre-existing)
2. un-: not (unhappy, unlikely)
3. re-: again (re-read, redo)
4. dis-: not, opposite of (disagree, dislike)
5. in-: not, into (inactive, inside)
6. mis-: wrong, badly (misunderstand, misbehave)
7. over-: too much (overcooked, overtired)
8. sub-: under, below (submarine, subway)