Korean phrase
~이랑 ~ 어떻게 구분해서 쓰나요? ~ i rang ~ eo tteo ke ku bun hae seo sseu na yo
Meaning
How do you decide which of ___ and ___ to use?
When to use it
This asks how to choose between two expressions. It is a neutral question about which form to use with different people or in different situations.
Example dialogue
존댓말이랑 반말 어떻게 구분해서 쓰나요? chon daen ma ri rang pan mal eo tteo ke ku bun hae seo sseu na yo
How do you decide which to use, honorific speech or casual speech?
상대와 상황에 따라 달라요. 보통 처음 만나거나 윗사람이면 존댓말을 써요. sang dae wa sang hwang e tta ra tal la yo po tong cheo eum man na geo na wit ssa ra mi myeon chon daen ma reul sseo yo
It varies depending on the person and the situation. Usually, people use honorific speech when meeting someone for the first time or speaking to someone senior.