있다/없다 = to exist/to not exist
These grammar points are very simple and are used every where in Korean.
있다: Shows that something exists: There is coffee = 커피가 있다 (있어요)
없다: Shows that something does not exist: There is no coffee = 커피가 없다 (없어요)
These grammar points can be used on anything, if you have a boy friend or not, a car or not, money or not, etc.
Look at the follow examples:
저는 남자친구가 없다 (있습니다) = I don’t have a boyfriend
저는 돈이 없습니다 = I have no money
저는 차가 있습니다 = I have a car
저는 책이 있어요 = I have a book/ I have the book
저는 한국 옷이 없어요 = I do not have Korean clothes