When, during
때 expresses the time when an action or state occurs or its duration.
When following a noun, 때 is used, and when following a verb, -ㄹ 때 is used when the stem ends in a vowel or ㄹ, and -을 때 is used when the stem ends in a consonant.
때 is not used together with 오전, 오후, 아침 or the days of the week.
Comparison:
What's the difference between 크리스마스에 and 크리스마스 때?
For some nouns, such as 저녁, 점심 and 방학, the meaning is the same whether they are written in the form of 'N 때' or 'N에'. However, for some nouns, especially those representing holidays, like 크리스마스 and 추석: - The form 'N에' refers to the specific day(s) of the holiday - The form 'N 때' refers to the approximate time period just before, during, and after the holiday For example: - 크리스마스에 refers to Christmas Day, December 25 - 크리스마스 때 refers to the span of the few days surrounding Christmas, such as the day before and the day after Christmas.
Either 때 or 에 can be used after nouns such as 저녁, 점심 and 방학 with no difference in meaning.
Expresses the time when an action occurs or its duration.
Can also be used with verbs in the form of (으)ㄹ 때
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