V-을/ㄹ 때
This pattern means 'when (someone) does' or 'when something happens.' Attach -을 때 after a verb stem ending in a consonant and -ㄹ 때 after a vowel. It is very useful for talking about the time of an action. Example: 계산할 때 돈을 깜빡했어요. = I forgot the money when I was paying.
계산할 때 돈을 깜빡했어요.
I forgot the money when I was paying.
