How do you say "(Let us) throw the cat away, in the most polite way (습니다)? I read that it should be '고양이를 버리십시다', but in the same exercise they changed the sentences. Based on their second way it should actually be '고양이를 버립시다.' I thought it was a shortening but, then they went back to 십시다. Are they interchangeable? What is the difference? How is it formed? What I saw vs. What I thought it should be Which is correct? 담배를 끊읍시다 담배를 끊으십시다 앞줄에 앉읍시다 앞줄에 앉으십시다