Translation:You are eating cookies.
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There is no hard and fast rule. It's all about the endings on the noun. Because of the a it means it plural but the endings differ on whether or not it is masculine, feminine, or neuter and which case it is in. Here's an example where the relevant one is the neuter noun declination. The base form is Ciasteczko and it is plural in the accusative case: https://en.wikibooks.org/wiki/Polish/Masculine_noun_declension https://en.wikibooks.org/wiki/Polish/Feminine_noun_declension https://en.wikibooks.org/wiki/Polish/Neuter_noun_declension
Yes, but we don't have jest in this sentence.