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1. What are the commonly used prefixes and suffixes in English
1. Common prefixes and suffixes
1. Common prefixes aero-：concerning the air of aircraft plane—aeroplane space—aerospace anti-：against； opposite of nuclear—antinuclear matter—antimatter war—antiwar auto-：of or by oneself biography—autobiography criticism—autocriticism be-：to treat as the stated thing friend—befriend little—belittle bi-：two； twice； double lingual—bilingual cycle—bicycle bio-：concerning living things chemistry—biochemistry sphere—biosphere by-，bye-：less important produce—by-produce way—byway centi-：hundredth part grade—centigrade meter—centimeter co-：together，with author—coauthor exist—coexist col-：( used before l ) together，with location—collocation com-：( used before b，m，p ) together，with passion—compassion con-：together，with centric—concentric federation—confederation contra-：opposite diction—contradiction natural—contranatural cor-：( used before r ) together，with relate—correlate respond—correspond counter-：opposite act—counteract attack—counterattack cross-：across； going between the stated things and joining them country—crosscountry breed—crossbreed de-：showing an opposite； to remove； to reduce code—decode value—devalue dis-：not； the opposite of advantage—disadvantage agree—disagree honest—dishonest em-：( used before b，m，p ) to cause to become body—embody power—empower en-：to cause to become； to make danger—endanger large—enlarge ex-：former ( and still living ) minister—ex-minister wife—ex-wife extra-：outside； beyond curricular—extracurricular ordinary—extraordinary fore-：in advance，before； in or at the front arm—forearm warn—forewarn il-：( used before l ) not legal—illegal literate—illiterate im-：( used before b，m，p ) not moral—immoral possible—impossible in-：not direct—indirect sensitive—insensitive infra-：below in a range； beyond red—infrared structure——infrastructure inter-：between； among change——interchange national——international intra-：inside，within； into city——intracity department——intra-department ir-：（used before r）not regular——irregular responsible——irresponsible kilo-：thousand gram——kilogram meter——kilometer macro-：large，esp. concerning a whole system rather than particular parts of economics——macroeconomics structure——macrostructure mal-：bad or badly function——malfunction treat——maltreat micro-：extremely small computer——microcomputer electronics——microelectronics mid-：middle day——midday night——midnight mini-：small； short bus——minibus skirt——miniskirt mis-：bad or badly； wrong or wrongly fortune——misfortune understand——misunderstand mono-：one； single plane——monoplane tone——monotone multi-：more than one； many purpose——multipurpose national——multinational non-：not resident——non(-)resident sense——nonsense out-：outside； beyond live——outlive door——outdoor over-：too much； above； additional head——overhead time——overtime poly-：many centric——polycentric syllabic——polysyllabic post-：later than； after graduate——postgraduate war——postwar pre-：before； in advance pay——prepay war——prewar pro-：in favor of，supporting America——pro-America abortion——pro-abortion pseudo-：not real； false name——pseudonym science——pseudoscience re-：again； back to the former state unite——reunite use——reuse self-：by means of oneself or itself； of，to，with，for，or in oneself or itself employed——self-employed taught——self-taught semi-：half； partly circle——semicircle final——semifinal step-：not by birth but through a parent who has remarried mother——stepmother childre