가: 마크 씨가 면접을 잘 봤는지 모르겠어요. 나.1: 잘봤을테니까 걱정하지 마세요 -> 잘 봤을 테니까 걱정하지 마세요 = He must have done well, so don't worry. 나.2: 잘봤을거에요 걱정하지 마세요 -> 잘 봤을 거예요. 걱정하지 마세요 = He must have done well. Don't worry. (나-2 has errors. 거에요 should be 거예요, and there should be a period after it to mark the end of a sentence.) 나-1 is a single sentence with the -테니까 clause stating the reason, whereas #2 has two complete sentences. The meaning is about the same.