"The boys are eating cheese."
Translation:Chłopcy jedzą ser.
They can't add tables of conjugation. But you can check this on Wiktionary: https://pl.wiktionary.org/wiki/je%C5%9B%C4%87 or here: http://en.bab.la/conjugation/polish/je%C5%9B%C4%87
I answered ci chłopaki jedzą ser,, according to the website below plulral of chłopak is chłopaki but duolingo said the correct answer is chłopacy. which one is correct ?https://en.wikibooks.org/wiki/Polish/Masculine_noun_declension