Possessive lesson notes
The possessive lesson notes seem to disagree with the examples in the lesson. I'm working under the assumption that the notes are wrong regarding the conjugation of Δικό
For example the notes read 2nd person singular (Δικό) σου
But the question reads
Ο σκύλος είναι δικός σου.
The question is correct because 'σκύλος' is a masculine noun, and so 'δικός' would be used.
Also, 'δικό' is not solely a singular word - it is also acceptable in plural form in many cases.
But yeah, the notes are wrong.
(δικός) σου masc., (δική) σου fem. (δικό) σου neutr. 2nd person singular. So ς is right in masculine.
My point is that the Notes don't actually give you that info, and always have Δικό no matter the gender or person.
It merely looks like the contributors put in the placeholder of (δικό) at some point. They all know the variants of course. They just never got back to fleshing it out. You should leave a report and/or go to facebook, email, whatever works to report it. They will get to it soon enough. Thank you for pointing it out.