This is the 6733rd most frequent Polish word.
eisai
"Eisai" is not a Polish word; it appears to be Greek, meaning "you are."
Used as a second-person singular indicative form of 'to be'.
Eisai bardzo zdolny i pracowity, co widać w twoich pracach.
You are very talented and hardworking, as can be seen in your works.
Used within an interrogative sentence to describe the subject.
Czy wiesz, że eisai najlepszym przyjacielem, jakiego mogłem sobie wymarzyć?
Do you know that you are the best friend I could ever dream of?
Used to indicate a state of being or capacity observed in the situation.