you

you is about another person or people.

they

they is about a group of people or animals.

of

of is about things and their parts.

they like the pillows of feathers. Do you?

they like the bubbles of soap. Do you?

they like a game of soccer. Do you?

they like a pool of water. Do you?

they like a field of grass. Do you?

they like a chest of treasure. Do you?