Learn Hardcore Korean: ojeone hoeuiga isseoyo. - I have a meeting in the morning.

오전 literally means AM or morning (time before noon) used for clock‐based scheduling, e.g. 오전 10시 (10 AM). 아침 refers to the early part of the day when you wake up and have breakfast—it’s more about the routine than a precise time slot.

What role does -에 play in 오전에?

-에 is a particle that marks time or place, translating roughly as “at” or “in.” Attached to 오전, 오전에 means “in the morning” or “during the forenoon.”

Why is 회의 marked with -가 instead of the object marker -을/를?

Because 있다 is an intransitive verb of existence/possession, its noun takes the subject marker -가 (or -이 after a consonant). 회의가 있다 literally means “a meeting exists,” which Koreans understand as “I have a meeting.”

How does 있어요 convey “have” in this sentence?

있어요 is the polite present tense of 있다. To say “I have X,” Korean speakers say “X exists” (회의가 있어요 = “there is a meeting”), and context makes it clear who has it.

Why is there no explicit subject like 저는 in the sentence?

Korean often omits the subject when it’s clear from context. Here, the speaker is talking about their own schedule, so 저는 (I) isn’t needed. Saying 저는 오전에 회의가 있어요 is correct but usually unnecessary in conversation.

What politeness level is 있어요, and can I use 있습니다 instead?

있어요 is polite informal (gentle polite), common in everyday speech. 있습니다 is polite formal, used in presentations or written announcements. For very formal contexts, you could say 오전에 회의가 있습니다.

How do I change this sentence to past or future tense?

Past tense: use 있었어요
오전에 회의가 있었어요. (I had a meeting in the morning.)
Future tense: use 있을 거예요
오전에 회의가 있을 거예요. (I will have a meeting in the morning.)

How can I turn it into a question or make it negative?

To ask: raise intonation or add a question marker—
오전에 회의가 있어요? (Do you have a meeting in the morning?)
오전에 회의가 있나요? is slightly more formal.
To negate: replace 있어요 with 없어요—
오전에 회의가 없어요. (I don’t have a meeting in the morning.)