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Opposites of the adjectives
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possible
impossible
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formal
informal
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responsible
irresponsible
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literate
illiterate
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pactical
impractical
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willing
unwilling
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legal
illegal
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mature
immature
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able
unable
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regular
irregular
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familiar
unfamiliar
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capable
incapable
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correct
incorrect
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patient
impatient
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likely
unlikely
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Okay!
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