εχθές too
Χθες sounds pretty unique from greek language. Το μου αρέσει.
*Μου αρέσει/Αυτό μου αρέσει/Μου αρέσει αυτό
What is wrong about: "Yesterday, I saw my aunt."?
Yes, I don't see any difference either.
there is no final ν before θεία!