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ISN'T | English meaning - Cambridge Dictionary
Is Not | Definition & Meaning - Merriam-Webster
When does `isn't ...` expand to "is ... not" and "is not ..."
ISN'T | meaning - Cambridge Learner's Dictionary
ISN'T definition in American English | Collins English Dictionary
"It isn't" vs. "it's not" - English Language & Usage Stack Exchange
Isn't Definition & Meaning - Merriam-Webster
isn’t - Oxford Learner's Dictionaries
No or not ? - English Grammar Today - Cambridge Dictionary
NOT definition and meaning | Collins English Dictionary