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B2 NEGATIVE PREFIXES
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friendly
unfriendly
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tidy
untidy
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true
untrue
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mature
immature
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polite
impolite
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patient
impatient
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expensive
inexpensive
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reliable
unreliable
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responsible
irresponsible
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happy
unhappy
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kind
unkind
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Okay!
formal
informal
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Okay!
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