"Tak, jestem mężczyzną."
Translation:Yes, I am a man.
January 8, 2016
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The instrumental case is also used for predicates of the verbs "być" (to be), "zostać" (to become), and "interesować się czymś/kimś" (to be interested in something), except for lone adjectives and in the impersonal construction "To jest ..." (This is ...).
For details see https://en.wikibooks.org/wiki/Polish/Noun_cases#Instrumental.
Next time, you could look up the full declension table on a reference such as Wiktionary https://en.wiktionary.org/wiki/mężczyzna.