gyesanhal ttae hyeongeumgwa kadeureul modu sayonghal su isseoyo.

object particle

Breakdown of gyesanhal ttae hyeongeumgwa kadeureul modu sayonghal su isseoyo.

• 있다: to be
• 과: and
• 때: time

Questions & Answers about gyesanhal ttae hyeongeumgwa kadeureul modu sayonghal su isseoyo.

What function does the ending -을 때 serve in this sentence?

-을 때 attaches to the verb stem 계산하- (from 계산하다, “to calculate/pay”) to form 계산할 때, meaning “when (you) pay.” It marks the time or occasion of an action.

Why are 현금 and 카드 joined with 과, and why is the object marker -를 attached only to 카드?

과 is the conjunction “and” used after a noun ending in a consonant (현금 ends in ㅁ). When you list items and then apply a case marker to the whole list, you only mark the final noun. Here, 카드 takes -를 to mark “cash and card” collectively as the object of 사용할 수 있다.

What is the role of 모두 here? Can you use 둘 다 instead?

모두 means “all” or “both” and emphasizes inclusion of the entire list (cash and card). You can also say 둘 다 (“both of the two”) for two items:
• 계산할 때 현금과 카드를 둘 다 사용할 수 있어요.
모두 sounds slightly more formal/neutral and works for any number of items, while 둘 다 is casual and limited to two.

What does 사용할 수 있어요 literally mean, and what is its grammatical structure?