"Is the house empty?"
Translation:집은 비어 있습니까?
Am doing the placement test. Is -고 있다 the same as -어 있다? I never learned about the second one.
For verbs that show a state of condition, like 비다 서다, 앉다, you should add 있다 after conjugating them. This way, it can be understood in Korean that it is in the state of being empty or in the state of sitting. If you just say 나는 앉아 without 있다 it just sounds like "sitting is something I do" vs 나는 앉아 있어요 (I am sitting right now).