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FCE word formation prefixes
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approve
disapprove
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Okay!
mature
immature
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Okay!
appear
disappear
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Okay!
legal
illegal
Oops!
Okay!
adequate
inadequate
Oops!
Okay!
rational
irrational
Oops!
Okay!
useful
useless
Oops!
Okay!
practical
impractical
Oops!
Okay!
similar
dissimilar
Oops!
Okay!
satisfied
dissatisfied
Oops!
Okay!
mortal
immortal
Oops!
Okay!
accurate
inaccurate
Oops!
Okay!
realistic
unrealistic
Oops!
Okay!
encourage
discourage
Oops!
Okay!
affect
unaffect
Oops!
Okay!
responsible
irresponsible
Oops!
Okay!
behave
misbehave
Oops!
Okay!
legible
illegible
Oops!
Okay!
predictable
unpredictable
Oops!
Okay!
sensitive
insensitive
Oops!
Okay!
usual
unusual
Oops!
Okay!
impressive
unimpressive
Oops!
Okay!
real
unreal
Oops!
Okay!
forgettable
unforgettable
Oops!
Okay!
reversible
irreversible
Oops!
Okay!
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