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　1) dis(not, the opposite of) disadvantage, dislike, disagree, disappear,disarm, disaster, disastrous, disappoint, disable, disability, discharge,disclose, discount, discourage, discover, discovery, discrepancy, disease,disgrace, disguise, disgust, dishonor, dishonest, dislike, dismay, disorder,dispatch, disperse, displace, displacement, displease, disregard, dissatisfy,distort , distract, disintegrate, isparage, dispassion, disproportionate

　　2) in- (not, in, into) inability, incorrect, inability, incapable,indirect, inhuman, injustice, informal, inside, include, inclusive, income,increase, increasingly, incredible, indefinite, independence, independent,indifferent, indirect, indispensable, individual, indoor, inertia , inevitable,infamous , infinite, inhabit , inhabitant, inherent , inject, inland , inlet ,inner, innocent, innumerable , input, inquire, inquiry, insane, insensitive,insert, inside, insight, insist, inspect, inspiration , inspire, install,installation, installment , instance, instant, instinct, insulate , intense,interior, internal, into, intrinsic, invade, invalid , invaluable , invariably ,invasion, invert , investigate, invisible, involve, inward, incomplete,indecisive, inedible, inept, inevitably, infection, infirm, injection, innate,insatiable, insecurity, insider, insidious

　　3) im- (not, in, into) impossible, imbalance, immature, immoral, impatient,implicit , impress, impression, import, immigrate, imprison, immerse

　　4) il- (not) illegal, illiterate, illogical ir- (not) irregular,irresponsible, irrespective

　　5) un- (not) unable, uncover, undo, undoubtedly, undress , uneasy,unemployment , unexpected, unfold , unfortunately, unimportant, unlike, unload,unusual, unaware, enlightened, unparalleled, unsustainable,

　　6) non- (not) nonsmoker, nonexistence, non-cooperation, nonstop, nonmetal,nonresident, nonsense, nonfundamentalist, nonspecialist

　　7) mis- (wrong, wrongly) mislead, misspell, misstep, misfortune, misuse,misguided, misinformation

　　8) de- (showing the opposite, to remove, to reduce) deform, deface,demobilize, destruction, deforest, denationalize, depress, depression, decode,decrease, degenerate , degrade , descend, descendant , descent

　　9) pre- (before, in advance) 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, preconception, prediction, prescientific, presumptively

　　10) ante-, (before, in advance) anteroom, ante-Christian, antemeridian,anticipate, antique

　　11) fore- (in advance, before, in or at the front) forearm, forehead,foreman, foretell , foresee , forefather , foreleg, forerunner , fore ,foremost, forecast, forewarn

　　12) ex- (out, out of, former) ex-minister, ex-president, ex-Soviet Union,ex-wife, export, exclude, exclusive, excursion, exhibit, exile , exit, exotic ,expand, expansion, expedition , expel , expend , expenditure , expense, explode,explosion, explosive, expose, exposition , exposure, express, expression,extend, extension, extensive, exterior, external, extinct, extra, extract

　　13) post- (later than, after) postgraduate, postwar, postmeridian,postpone, postscript

　　14) sub- (under, below, less important) sub, subject, subway, subtitle,subdivide, submarine , sub-zero, submerge, submit, subordinate , subscribe ,subsection, subsequent, subsidiary , subsidy , substance, substantial,substitute, subtract, suburb, subconsciously, subtly

　　15) infra- (below in a range, beyond) infrastructure , infrared

　　16) re- (again, back to a former state) react, reaction, recall, recede ,receipt, recipient , reclaim , recognize, recognition, record, recorder,recover, recovery, recreation, recur , recycle , redundant , reflect,reflection, reflexion, reform, refrain , refresh, refreshment , refund , refute, reinforce, reject, remember, remind, removal, remove, renaissance , renew,repay , repeat, repeatedly, repel , repetition, replace, replacement, represent,representative, repression , reproduce, respect, respond, response,responsibility, responsible, restore, resume, return, reunion , revise,revive

　　17) co-, col-, com-, con-, cor- (with together) co-existence, cooperative ,co-author, coalition , coherent , coincide , coincidence , collaboration ,colleague, collide , collision, collocation, compassion, compassionate,concentric, confederation, conjoin, coordinate, correlate, correlation,correspond

　　18) inter- (between, among) interchange, interchangeable, interdependent,interpersonal, interview, interact , interaction, intercourse , interface ,interfere, interference, Internet, interrupt, interval, intervene

　　19) macro- (large) macroeconomics , macrocosm , macrostructure

　　20) micro- (extremely small) microcomputer, microeconomics , microscope,microphone, microsurgery, microelectronics, microbiologist

　　21) super- (greater or more than) super, supermarket, supersonic ,superman, superpower, supernatural, supervise , superb, superficial,superintendent , superior, superiority , supreme, supersystem

　　22) sur- (more than, beyond) surplus, surtax, surface, surpass , surround,survival, survive, suspect

　　23) ultra- (beyond, very, too) ultramodern, ultrasound, ultra-violet

　　24) auto- (of or by oneself) auto, autocriticism, autoland, automobile,automation , automatic, autobiography , autonomous , autonomy

　　25) mal- (bad, badly) malfunction, maltreat , malnutrition ,malpractice

　　26) tele- (at or over a long distance, by or for television) telegram,television, telegraph, telephone, telecommunications , telescope, telescreen,teleswitch, televise

　　28) semi-, hemi- (half) semicircle, semiconductor, semi-colony , semifinal,hemisphere

　　29) uni-, mono- (one) uniform, unify , union, unique, unit, unite, unity,universe, universal, university, monologue , monoplane, monopoly , monotone,monotonous , carbon monoxide

　　30) bi-, di- (two) biweekly, bicycle, bilateral , billion, bilingual,dialogue, carbon dioxide

　　31) tri- (three) tricycle , triangle, triangular, trilogy , triple,trigonometry

　　32) quadri-, quadru- (four) quadruple, quadrangle

　　33) penta- (five) pentagon, Pentagon, Pentium

　　34) hexa- (six) hexagon, hexangular mill- (thousand) millennium,millimeter

　　35) sept- (seven) September, Sept-Wolves nona- (nine) nonagon, November

　　36) octa- (eight) octagon, octave, octopus, October 38) deci-, deca- (ten)decade, decimal

　　39) centi- (hundredth part) centigrade, centimeter, centipede, century

　　40) kilo- (thousand) kilo, kilometer, kilogram (me), kilowatt

　　42) multi- (many) multipurpose, multinational, multiple, multiply,multitude

　　43)counter-,anti-,contra- (opposite, against counteract, counterattack,counterclockwise, counterrevolutionary, antibiotic, antigravity, antimatter,antiwar, antinuclear, contradict , contradiction, contramissile, contranatural,contrary, contrast, anticonsumerism

　　44) mini- (smallest, short) minibus, miniskirt, minimum, minister,ministry, minor, minority, minute

　　45) max- (greatest) maximum, maximal, maximize

　　46) out- (outside, beyond) outdo, outwit, outlive, outnumber, outdoor,outstanding, outskirts , outward, outcome, outer, outing , outline, outlook,output, outrage , outside

　　47) over- (too much, above, additional) overwork, overuse, overtake,overpass , overthrow , overturn , overall, overdue , overhead, overhear ,overlook, overseas, overtime

　　48) trans- (across, on or to the other side of) transaction ,transatlantic, transcend , transfer, transform, transistor , transit ,transition , translate, translation, transmission, transmit, transmitter,transparent, transplant, transport, transportation

　　49) under- (too little, below) underdevelop, underdevelopment,underestimate, undergraduate, underground, underlie , underline, undersea,underlying , undermine , underneath, underwear

　　50) neo- (new) neo-Nazism, neolithic

　　51) be- (cause to be or have) befriend, belittle

　　52) bio- (life) biology, biography , autobiography, antibiotic,biochemistry, biosphere, biomedical

　　53) en- em- (cause to become, put into the stated condition) embody,empower, endanger, enlarge, enrich, encompass, enthrone, entrench

　　54) extra- (outside, beyond) extracurricular, extraordinary

　　55) mid- (middle) midday, midnight

　　56) poly- (many) polycentric, polydirectional, polysyllabic

　　57) pseudo- (not real, false) pseudomemory, pseudonym, pseudoscience

　　58) thermo- (heat) thermochemistry, thermometer

　　59) vice- (next in rank below) vice-chairman, vice-president

　　60) aero- (air) aerial , aeroplane, aeronautics, aerospace

　　61) cross- (across, going between the stated things and joining them)cross-country, crossbreed

　　62) intra- (inside, within; into) intracity, intra-department, intranet

　　63) pro- (in favor of, supporting) pro-America, pro-abortion

　　64) self- self-employed, self-taught

　　65) step- (not by birth but through a parent who has remarried) stepmother,stepchildren