​ (a)   우산은 누구 우산이에요?

Whose umbrella is that (close to the listener)?

​ ​ (a)   분은 누구 아버지예요?

Whose father is he(far away from both the listener and the speaker)?

How is the Korean 이/그/저 system different from the English 'this/that' system?

How would you space this book (이+책) and this thing (이+것)? And why are they spaced that way?

After 이것/그것/저것 we can add either 은/는 or 이/가, can you write down all the shortened forms of 이것/그것/저것+은 and 이것/그것/저것+이?

How do you say 'my book' in Korean? And can you describe why you spaced the 'my' and 'book' in the way you did?

How do you say 'That(close to the listener) book is not my book?'

Can you explain how N은/는 and N이/가 is different?

You are encouraged to use concrete examples to explain their differences.