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grammar - When do we say "skies" instead of "sky"? - English …
difference - When should I use the word "skies"? - English …
grammatical number - Using "skies" instead of "sky" - English …
Is sky a countable noun or an uncountable noun? [duplicate]
idioms - Taking it to the sky/skies - English Language & Usage …
to take the skies - English Language Learners Stack Exchange
etymology - Where does "the sky is falling" come from? - English ...
Where does the phrase "hold down the fort" come from?
Where does the phrase "cool your jets" come from?
Where does this proverb come from? “If you want to go fast, go …