3) im- impossible, imbalance, immature, immoral, impatient, implicit , impress, impression, import, immigrate, imprison, immerse

　　4) il- illegal, illiterate, illogical

　　5) ir- irregular, irresponsible, irrespective

　　6) un- unable, uncover, undo, undoubtedly, undress , uneasy, unemployment , unexpected, unfold , unfortunately, unimportant, unlike, unload, unusual, unaware, unenlightened, unparalleled, unsustainable

　　7) non- nonsmoker, nonexistence, non-cooperation, nonstop, nonmetal, nonresident, nonsense, nonfundamentalist, nonspecialist

　　8) mis- misjudge, misunderstand, mislead, misspell, misstep, misfortune, misuse, misguided, misinformation

　　9) de- deform, deface, demobilize, destruction, deforest, denationalize, depress, depression, devalue, decode, decrease, degenerate , degrade , descend, descendant , descent

　　10) pre- prefix, pre-historic, precaution, precede , preceding, preclude , predecessor , predict, predominant , preface, prejudice, preliminary, premature , premier , premise , premium , preparation, prepare, prepay, preside , president, presumably, presume , pretext , prevail, prevent, previous, prewar, prediction, pre-scientific, presumptively, preconception

　　11) ante-, anteroom, ante-Christian, antemeridian, anticipate, antique

　　12) fore- forearm, forehead, foreman, foretell , foresee , forefather , foreleg, forerunner , fore , foremost, forecast, forewarn

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