When to use teacher in Korean
Korean: 선생님[ seon-saeng-nim ]

When to use it
선생님 means "teacher" in English. It is a polite and common word for the person who teaches you at school or in a class. You can use it to talk about a teacher or to call the teacher directly, like "Teacher!" (선생님).
Example sentences
엄마가 우리 선생님을 집에 초대했어요.
My mom invited our teacher to our home.
선생님, 이거 뭐예요?
Teacher, what is this?
오늘 선생님이 숙제를 많이 주셨어요.
Today the teacher gave us a lot of homework.
길에서 선생님을 만나서 인사했어요.
I met my teacher on the street and said hello.
문구점에서 선생님 드릴 선물을 샀어요.
I bought a gift for my teacher at the stationery store.
수학여행에서 선생님과 사진을 찍었어요.
I took a picture with my teacher on the school trip.