Learn Hardcore Korean: oneul eopmuga manhaseo bappayo. - I'm busy today because I have a lot of tasks.

오늘 means “today.” As a time adverb, it can stand alone without a particle when the time reference is obvious. Placing it at the front simply tells us when the action happens.

Why is there a 가 after 업무?

The particle 가 marks 업무 (“work,” “tasks”) as the subject of the clause 업무가 많아서. It tells us that it’s the amount of work (not something else) that’s “many” and causing the busyness.

What does the ending -아서 in 많아서 do?

The connective ending -아서 attaches to the verb/adjective stem 많- (“to be many”) to express reason or cause. So 업무가 많아서 means “because (I) have a lot of work.”

Could we use -어서 instead of -아서?

Korean uses vowel harmony for these endings. After stems with the vowel ㅏ or ㅗ (like 많-), you attach -아서. After other vowels, you attach -어서. Using -어서 with 많- would sound unnatural in standard Korean.

Why is 바쁘다 conjugated as 바빠요?

바쁘다 is an adjective meaning “to be busy.” To make it polite and informal (the 해요 form), you form the 아/어 stem: 바쁘- + 아요 → 바빠요. The -요 ending makes the sentence polite.

Why isn’t there an explicit subject like 저는 (“I”) in this sentence?

Korean often drops subjects when they’re clear from context. Here, since you’re talking about your own state of busyness, 저는 is understood and can be omitted for natural flow.

Can I change the word order to 업무가 많아서 오늘 바빠요?

Although Korean word order is flexible, the subordinate clause expressing reason (업무가 많아서) typically comes before the main clause (바빠요). You can move 오늘 around (e.g., 업무가 많아서 오늘 바빠요), but the reason–result order stays the same.

What’s the difference between 업무 and 일?

업무 refers specifically to professional duties or tasks at work, sounding more formal. 일 is a general word for “work” or “thing.” So 업무가 많아서 emphasizes “having many work-related tasks.”