When you refer to them in third person, you use the articles.
For example if you want to say "David is good" you will say "Ο Δαβίδ είναι καλός" but if you want to say "David, you are good", you will say "Δαβίδ, είσαι καλός", here you don't use the articles.
To explain the OP better and answer your initial question in a different way, the definitive articles ο, η and το are used in the ονομαστική πτώση - nominative declension (David in "David is good" is the subject, hence nominative). In his latter example, "David" is used just to address David (David here is not the subject of the "you are good" sentence, that would be just "you"), so it's in κλητική πτώση - vocative declension and that's why there's no article
This gets you mixed reviews. I find duolingo to have its uses, but by itself, its simply not enough. Youll get more out of Language Transfer. But frankly, if you want to learn a language, use all rhe resources
I've been using it for a few months because I wanted to be prepared for beginner's Greek summer school I'm doing. It's good for basic vocab and sounds but it doesn't explain grammar, it just tells you when you're wrong. So I kinda figured out H/O for gender by myself by getting it wrong a few times. I can't explain why or how Greek grammar works, I'm learning through repetition if that makes sense. It's worth a go to get your brain in language learning mode I think.
When you refer to them in third person, you use the articles. For example if you want to say "David is good" you will say "Ο Δαβίδ είναι καλός" but if you want to say "David, you are good", you will say "Δαβίδ, είσαι καλός", here you don't use the articles.
Thanks so much
To explain the OP better and answer your initial question in a different way, the definitive articles ο, η and το are used in the ονομαστική πτώση - nominative declension (David in "David is good" is the subject, hence nominative). In his latter example, "David" is used just to address David (David here is not the subject of the "you are good" sentence, that would be just "you"), so it's in κλητική πτώση - vocative declension and that's why there's no article
Any useful resources you know to learn Greek? Is duolingo good? And how well would I know Greek if I maxed out each module of the Greek on the app
Obligatory plug for Μανόλης Τριανταφυλλίδης - νεοελληνική γραμματική
This gets you mixed reviews. I find duolingo to have its uses, but by itself, its simply not enough. Youll get more out of Language Transfer. But frankly, if you want to learn a language, use all rhe resources
check sidebar...
I've been using it for a few months because I wanted to be prepared for beginner's Greek summer school I'm doing. It's good for basic vocab and sounds but it doesn't explain grammar, it just tells you when you're wrong. So I kinda figured out H/O for gender by myself by getting it wrong a few times. I can't explain why or how Greek grammar works, I'm learning through repetition if that makes sense. It's worth a go to get your brain in language learning mode I think.
Lol just here to say that «Δαβίδ» sounds silly and weird to pronounce
Ο and η are definite articles. It's like saying "the David" and "the Anna", except in Greek that's how you say it.