pre-: before
e.g.: prevent, preview, prepare

re-: repeat
e.g.: replay, revive, renew

de-: away from
e.g.: depart, depreciate

se-: away from, apart from
e.g.: separate, select

hy-: water
e.g.: hydrant

penta-: five
e.g.: pentagon, pentacle

bi-:two
e.g.: bilingual, biasing

tri-:three
e.g.: triable, triangle

mono-:one
e.g.: monothestic, monochord