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FCE word formation prefixes

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