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Classic usage
Reading level: hard
Estimated CEFR level: B2 — Upper-Intermediate
Estimated from word frequency; not an official CEFR classification.
Inherited from Middle English connen, inherited from Old English cunnan (“to know, know how”), inherited from Proto-West Germanic *kunnan (“recognize, know how”), inherited from Proto-Germanic *kunnaną (“to know, know how”), inherited from Proto-Indo-European *ǵneh₃- (“to know”) Doublet of can.
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Classic usage
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