I have a more technical question: what is the typographically correct character for Ukrainian apostrophe? And which one do you use in casual writing?
U+2019 ’ RIGHT SINGLE QUOTATION MARK – the preferred character for apostrophe.
U+02BC ʼ MODIFIER LETTER APOSTROPHE – which I've been seeing being proposed as the correct one.
U+0027 ' APOSTROPHE – which is used here on Duolingo and in many places on Ukrainian Wiki (probably just due to convenience).
Can I use all of them in my answers?
U+0027 is the most common in writing (as that's what Windows has in it's Uklrainian layout)
U+02BC is the one that is part of a standard for Cyrillic .УКР domain names