20 Examples of Prefixes:
1. un- (not, opposite): unhappy, unclear, undo
2. re- (again, back): redo, reread, rewrite
3. pre- (before, beforehand): pre-game, pre-order, preview
4. mis- (wrongly, badly): misspell, mistake, misunderstand
5. in- (not, opposite): inactive, invisible, incorrect
6. dis- (not, opposite): dislike, disagree, disappear
7. over- (too much, excessively): overeat, oversleep, overcharge
8. under- (too little, insufficiently): underestimate, underpaid, undercooked
9. super- (above, beyond): superhuman, supersize, supersonic
10. sub- (below, under): submarine, submerge, subway
11. anti- (against, opposite): anti-gravity, antibiotic, anti-social
12. co- (with, together): cooperate, co-author, coworker
13. bi- (two, twice): bicycle, bilingual, biannual
14. tri- (three): triangle, tripod, triathlon
15. multi- (many, multiple): multi-tasking, multi-colored, multi-faceted
16. fore- (before, beforehand): forecast, forewarn, foresight
17. post- (after, following): post-war, postgraduate, post-mortem
18. pro- (for, in favor of): pro-choice, pro-active, pro-bono
19. trans- (across, beyond): transatlantic, translate, transgender
20. inter- (between, among): interact, internet, interstate