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
