"why are you smiling?" he said. change this into indirect speech

he asked why  I was smiling
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he asked why was i smiling 
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he asked why I was smiling
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he asked why I was smiling
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HE ASKED WHY I WAS SMILING.
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he asked why i was smiling
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he asked that why I was smiling
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He asked that why I was smiling.
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he asked me why i was smiling
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He told that why are they smiling.
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