un-: usual, happy, official, in-: visible, correct, formal, im-: possible, practical, patient, probable, ir-: regular, relevant, responsible, il-: legal, logical, legible, dis-: like, agree, appear, advantage, honest, obey, qualify, non-: alcoholic, resident, stop, smoking,

U3 Gateway B1 Negative prefixes un-,in-,im-,ir-,il-, dis-, non-

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