1. It's a form. 원 별 말씀을 다하십니다 means you don't need to thank me for what you've done and It's formal. you are not supposed to use it to your friends or family 원 is an exclamation it is almost used in above sentence. you can add 별 in this kind of sentence 별 걸 다아네 It means how come you know all about these?(these in this sentence are that you think unimportant) 2. ~겸 is difficult to explain for me. so these sentences 소화겸 산책가다 - I'm going for a walk so that I can also digest 스트레스 풀겸 게임하다 - I'm playing games so that I can also release stress 3 wrong sentence. you need the person who talk to teacher Lee. OO가 물어봅니다 means OO is asking a question forgive my bad english.. and sorry for my bad and insufficient explanation cuz I'm tired (2.00AM) if you are ok I'll teach you some useful expressions haha -a korean who's sleepy zZZ-

:( nobody ??