inside the plane; in front of , behind...
Я у Назара вдома.
I'm at Nazar's home. (place)
справа ж/д вокзала
on the right (to the right) of the railway (train) station
Where is the cat?
by the door
Це справа. Це зліва.
It's on the right. It's on the left.
Кінотеатр справа від школи, а школа зліва від мого будинку.
cinema is to the right (on the right) of school and the school is to the left of my house.
on the ceiling
Он у Джона.
He is at John's.
Where's the house?
next to the playground
above, on the, inside in the cabinet
Она сейчас играет за домом.
She is playing behind the house now.
Where is the church in relation to the house?
on the left (to the left)