When to use back in Korean
Korean: 뒤[ dwi ]

When to use it
The word "뒤" means the back of something or the place behind it. You can use it to talk about position, like where a person or thing is. It is very common in everyday Korean for places at home and in other simple situations.
Example sentences
소파 뒤에 고양이가 있어요.
There is a cat behind the sofa.
집 뒤에 작은 정원이 있어요.
There is a small garden behind the house.
교실 뒤에 책장이 있어요.
There is a bookshelf at the back of the classroom.
제 뒤에 친구가 앉아 있어요.
My friend is sitting behind me.
가게 뒤에 주차장이 있어요.
There is a parking lot behind the store.
버스 뒤에 택시가 있어요.
There is a taxi behind the bus.