The plural form of 'sky' is 'skies'. However, 'sky' is often used as a noncount noun which means it doesn't have a plural form in most contexts. It's like the word 'air', we don't usually say 'airs'. We just say 'the sky is blue' even if we're talking about multiple areas of the sky. 'Skies' can be used in poetic context or when emphasizing the size or variety like in 'the skies above' or 'the northern skies'. 🌌
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