Is it possible that there are more terms for the color green? Like 초록색?
록색, 초록색, 푸른색... Quite a few
Yes, Duolingo. Just look at a mirror.
Is this kind of politeness level only used when talking to elderly people? I mean would it be used very often?
If you live in korea you will use it fairly often, but mostly for elderly people or people you arent close to, i use it probably just a little each day
My teacher (Korean man aged 60) says this level would be used in speaking in business situations to a person you don't know well or when speaking formally to a group--for example, when presenting at a conference.
Could this be appropriate to speak to your grandma? If not what would you use to ask questions?
있어요 instead of 있습니까 is not accepted