noun
a word used to identify any of a class of people, places, or things
adverb
a word that modifies a verb, adjective, or other adverb, indicating the time, place, manner, or degree of an action
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It is highly unlikely that the project will be completed on time, it will be done when pigs fly.
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You think I'll lend you my car? Sure, when pigs fly!
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As if I'll believe that story, when pigs fly!
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I'll start enjoying running when pigs fly, it's just not my thing.