Grammar

Question 1

이/가

Answer 1

이 consonant
가 vowel

Question 2

은/는

Answer 2

은 consonant
는 vowel

Question 3

을/를

Answer 3

을 consonant
를 vowel

Question 4

~에

Answer 4

The location can express where you are or were at, where you are going, where sth is
Or when the verb is 있다

Question 5

~에서

Answer 5

You are doing sth or did sth at that location
You describe how sth is like somewhere
You want to say “from”