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I'm good at/not good at Maths
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I'm good at/not good at swimming
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I'm good at/not good at IT
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I'm good at/not good at science.
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I'm good at/not good at playing tennis
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I'm good at/not good at dancing
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I'm good at/not good at History
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I'm good at/not good at singing
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I'm good at/not good at Art/painting
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I'm good at/I'm not good at playing football
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I'm good at/not good at riding a bike
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I'm good at/not good at Geography
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I'm good at/not good at speaking English