있어요 and 없어요 mean both "to have" and "there is", and they appear in many everyday expressions.
있어요
To have / there is
없어요
To not have / there isn't
시간 있어요?
Do you have time?
시간이 없어요
I don't have time
돈이 있어요
I have money
돈이 없어요
I don't have money
차가 있어요
I have a car
동생이 있어요
I have a younger sibling
남자 친구가 있어요?
Do you have a boyfriend?
고양이가 두 마리 있어요
I have two cats
질문이 있어요
I have a question
약속이 있어요
I have plans (an appointment)
수업이 있어요
I have a class
근처에 편의점이 있어요?
Is there a convenience store nearby?
화장실이 저기 있어요
The bathroom is over there
책상 위에 있어요
It's on the desk
집에 있어요
I'm at home
지금 어디 있어요?
Where are you now?
문제 없어요
No problem
괜찮아요, 필요 없어요
It's okay, I don't need it
아무것도 없어요
There's nothing / I have nothing
방이 있어요?
Do you have a room (available)?
자리 있어요?
Is this seat taken?
재미있어요
It's fun / interesting
재미없어요
It's boring
맛있어요
It's delicious
맛없어요
It tastes bad
멋있어요
It's cool / He looks cool
계세요
To be (somewhere), honorific of 있어요
선생님 계세요?
Is the teacher in?
있었어요
Had / there was
없었어요
Didn't have / there wasn't
어제 시험이 있었어요
I had an exam yesterday
있을 거예요
There will be / will have
내일 회의가 있을 거예요
There will be a meeting tomorrow
우산 있어요?
Do you have an umbrella?
아이가 있어요?
Do you have children?
아직 없어요
Not yet / I don't have any yet
여기 있어요
Here it is (when handing something over)
사람이 많이 있어요
There are a lot of people