Toggle Navigation
Games
Blog
Class PIN
Join for Free
Sign in
Toggle Navigation
Games
PIN
Join for Free
Blog
Pricing
Contact us
Help center
Sign in
Study
FCE word formation prefixes
0
%
0
0
0
Back
Restart
encourage
discourage
Oops!
Okay!
mature
immature
Oops!
Okay!
usual
unusual
Oops!
Okay!
appear
disappear
Oops!
Okay!
reversible
irreversible
Oops!
Okay!
forgettable
unforgettable
Oops!
Okay!
legible
illegible
Oops!
Okay!
rational
irrational
Oops!
Okay!
responsible
irresponsible
Oops!
Okay!
useful
useless
Oops!
Okay!
satisfied
dissatisfied
Oops!
Okay!
approve
disapprove
Oops!
Okay!
practical
impractical
Oops!
Okay!
legal
illegal
Oops!
Okay!
realistic
unrealistic
Oops!
Okay!
mortal
immortal
Oops!
Okay!
behave
misbehave
Oops!
Okay!
real
unreal
Oops!
Okay!
adequate
inadequate
Oops!
Okay!
impressive
unimpressive
Oops!
Okay!
predictable
unpredictable
Oops!
Okay!
sensitive
insensitive
Oops!
Okay!
affect
unaffect
Oops!
Okay!
accurate
inaccurate
Oops!
Okay!
similar
dissimilar
Oops!
Okay!
Your experience on this site will be improved by allowing cookies.
Allow cookies