"Todavía eres joven."
In sentence was in Duolingo. Shouldn't it use verb "estar" (since estar is used for condition and "joven" is condition) instead of "ser"?
3 Answers
Ser joven is to be young and estar joven is to look young. You will spend many years working out when to use ser and when estar. Estar can be state/condition and ser is more essence, Ser makes sense here.
Ser is used much more than estar so it is probably easier to concentrate on when to use estar. Some sentences change meaning depending on verb choice.
this site has guides written by members and notes in the reference section.
This blog is excellent but it is in Spanish so you may need to translate some bits.
As you are a beginner concentrate on the basics and add more subtlety later.
In this case "joven" is a characteristic--"ser" is used. If you are stating that the actual age of the person is "young." If you're expressing an opinion then "estar" Learn the basics first then you can deal with the subtle differences later on, as Mardle has stated.
See my post on this.
Ser and Estar--my post
Until you figure it out, you can simply say, ie: Sigues joven todavía.
This is an abreiviated form of: Sigues siendo / estando joven todavía. This is a very common sentence structure and can be used in many situations with various verbs.