"The man eats chicken."

Translation: Ο άντρας τρώει κοτόπουλο.

[shranz]

why Ο άντρας τρώει το κοτόπουλο is not ok?

[D_..]

Ο άντρας τρώει το κοτόπουλο = the man eats the chicken
The exercise only says κοτόπουλο, without an article. That means that the man eats chicken in general or that he is eating some chicken.

[DrAlbertoParedes]

How can i know whether omicron or omega is used in a particular word?

[jaye16]

Each word needs to be learned individually, Duo uses each new word several times in a lesson so you can get used to the spelling. One very important hint is that the first person in the present tense.... e.g. I have έχω , I see βλέπω, I drink πίνω etc always ends with ω. The word I (Εγω) isn't even needed.

[LapFung]

Google Translate gives me "Ο άνθρωπος τρώει κοτόπουλο." Isn't it acceptable?

[jaye16]

άντρας means man άνθρωπος means person. Instead of google translate try hovering over the words and the correct translation will appear.

[DebUlma]

What is the difference between άντρας and άνδρας;

[mizinamo]

No difference in meaning. Use either one.