já nejsem - I am not, ty nejsi - you are not = you aren't ( č. j. ), on není - he is not = he isn't, ona není - she is not = she isn't, ono není - it is not = it isn't, my nejsme - we are not = we aren't, vy nejste - you are not = you aren't ( č. mn. ), oni nejsou  - they are not = they aren't,

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