Dis-, di-, asunder, separation: disarm, diffuse, disown, divorce; Fr., des-, de- in defer, defy, delay, descant.
Ex-, e-, out, out of, proceeding from: exclude, exhale, ex-governor, extract, educe, elect, emanate, evade.
Extra-, beyond: extraneous, extraordinary, extravagant.
In-, in, into, on: infer, invade, invent. It also becomes il-, im-, ir-, before certain consonants, as illusion, improve, irrigate.
In-, not: incapable, illiberal, impious, irrelevant, ignoble.
Inter-, intro-, among, between, within: interfere, intervene, introspection.
Male-, bad, ill, wrong: malcontent, malpractice, maltreat.
Mis-, ill, wrong: misadventure, misalliance; Fr., mischief.
Non-, not: nonage, nonentity, nonsense.
Ob-, toward, facing, against: object, obstruct. It also becomes oc-, of-, op-: occur, offer, oppose.