In Korean, demonstrative pronouns that refer to object(or people) have different expressions depending on distance.이 + noun: when an object is close to the speaker
그 + noun: when an object is close to the listener
저 + noun: when an object is far from both the speaker and the listener

We can make a lot of words out of these 이, 그, 저
For things, items

It/That/That(over there)
For person

This person/That person/That person(over there)
For place

Here/There/Over there

1. ( ) 음식 | This food |
2. ( ) 우유 | That milk over there |
3. ( ) 커피 | That coffee |
4. ( ) 어디예요? | Where is this place? |
5. ( ) 예뻐요. | That place over there is beautiful. |
6. ( ) 알아요. | I know that. |
Words & Answer
Words
집 | house |
사람 | person |
음식 | food |
우유 | milk |
어디예요? | where is ~? |
예뻐요 | pretty |
알아요 | know |
Answer
1. 이 음식 | This food |
2. 저 우유 | That milk over there |
3. 그 커피 | That coffee |
4. 여기(=이 곳) 어디예요? | Where is this place? |
5. 저기(=저 곳) 예뻐요. | That place over there is beautiful. |
6. 그거(=그것) 알아요. | I know that. |
→ For quesiton 6; When neither the speaker nor listener is looking at an object, but instead referring to something mentioned earlier in the conversation as 'that', always use the word '그'.