1. No.^^/ It should be "문을 여세요" not "문을 열으세요"^^/ As you said, "-으세요" is used for verb stems with 받침 except for "ㄹ" 받침 like 열다. 2. 뜯다 = to rip open 곳 = a place, part 뜯는 곳 = the part where you can rip open packages or wrappers. \^o^/

문을 여세요= 문을 열도록 하세요 = 문을 열으세요. and 뜯는곳 mean open part. open section. ex) where is open part this cookies box??