"My" gets changed with reference to the thing that's mine.

There are 3 kinds of things: Feminine, Masculine, and Neutral

General rule of thumb: Things ending in:

• A = Feminine = moya (a as in tart)
• Consonant = Masculine = miy/meey (i as in spaghetti [thats why I put a double-E], y as in may)
• O = Neutral = moye (same y, e as in bet)

Same thing for Whose:

• A = Feminine = chiya (chi as in chill, ya is in yard)
• Consonant = Masculine = chiy (chi as in chill [different i than above sorry lol], y as in may again)
• O = neutral = chiye (just like moye, but with a ch)

Example:

• Trava (trah-vah) = grass = Fem. = Chiya trava? Moya trava.
• Stil (steel) = table = Masc. = Chiy stil? Miy stil.
• Pyanino (p-yah-neeno) = piano = neutral = Chiye pyanino? Moye pyanino.
  

Some more tricks you might find helpful:

While we're here, I'm going to also use the same system to teach you "She/He/It" in the Ukrainian sense, because we use the same rules as above to say "it" - but then we also use the same rules to say He/She. It's actually easier than English, because regardless if it's a feminine object, or a feminine human, it's still "She".

AND - I will show you adjective conjugation - because it's the same rule for an adjective describing that thing/person - you'll see below.

AND - you will learn the word "that", similarly conjugated.

• That = Ta, Toy, To
• She/He/It = Vona, Vin (veen), Vono
• Green = zelene (when a noun)

OK. let's try it. That grass - it's Green. (then table, then piano)

• Ta trava - vona zelena.
• Toy stil - vin zeleniy.
• Te pyanino - vono zelene.

Technically, it IS green = vona YE zelena. But the way English contracts "it's", Ukrainian can just drop the "is" entirely in day-to-day speech.

OK I hope that's not too confusing, I know I went like 3 levels up in one shot lol. Focus on the "That" and the It/he/she if you're confused. I left the adjective there as an example. Most adjectives follow the same a/iy/o ending, but notice something:

The 1st and last word rhyme, and the middle 2 words rhyme. Well, almost. But there's a pattern there. Almost invariably, Ta/Toy/Te follows the adjective conjugation rules. So if you can remember your "that" conjugations, you will know how to conjugate like all the adjectives.

For the "she/he/it": it almost rhymes with the thing. The Fem and Neutral almost always rhyme. That's how you remember what to use. Vono pyanino. Vona trava.

OK last bit. Plurals are really easy to conjugate, they all have one:

The grass, table, and piano - all of THEM are "vony". They're green:

Vony zeleni

It doesn't matter if it's 3 pianos, 3 grasses, or 3 tables, or 1 of each.

Anyway, I'm answering you because your particular question reminded me of when my grandpa taught me those tricks when I was about 5yo growing up in Lviv, so I'm happy to pass it on. I'm kinda into this, because language is cool, so feel free to ask more here or via PM along your journey. And if I don't know I can figure it out and learn myself (I've been in the US so long that I'm forgetting things).

In case you haven't figured it out yet, there are 2 really nice things about Ukrainian compared to English, both of which made me go "seriously, wtf why" when learning English:

1. Once you know the alphabet, you can read any word correctly. Every letter has one sound, and never another. 5yo you can read the Odyssey fluently. You won't understand all the words, but you can read it. We don't have Spelling Bees after like 2nd grade.
2. Words in sentences can be moved around very easily - there are like 3 ways to rearrange a sentence and it still means the same thing, because we connect adjectives to nouns based on that conjugation I showed you above - not according to their position. I jumped into the water:
   1. Ya pirnuv u vodu (pirnuv = dove, vodu = water)
   2. ya u vodu pirnuv (this is grammatically equal to #1)
   3. u vodu ya pirnuv (we can do this one in English actually, but it would be considered poetic. perhaps not the go-to in ukrainian, but common way of speach: into the water i dove)
   4. Anyway, this makes poetry/verse easier, and much more flexible/forgiving.

Tune in next week for recursivethinking's random bouts of inspiration.