하다 vs 되다: 'Do' vs 'Get Done / Become'

You learned 하다 ("do") on day one, and it works so widely that it becomes a reflex — 준비하다, 취소하다, 시작하다, 걱정하다. So when you want to say "it's ready," "it got cancelled," or "I'm worried," your instinct reaches for the 하다 verb you already know. But Korean often wants a different verb here: 되다. Where 하다 says someone actively does the action, 되다 says the thing gets done, happens, or comes about — with no doer in the picture. Mixing them up is one of the most persistent intermediate errors, precisely because 하다 is right so often that you stop questioning it.

The core split: agent vs emerging result

Almost every 명사+하다 verb has a 명사+되다 twin, and the two are not stylistic variants — they encode different situations:

• 명사 + 하다 = someone (an agent) actively does the noun. There is a doer, and usually an object.
• 명사 + 되다 = the noun happens / gets done / comes about on its own. There is no active doer; you're reporting a result or a state that emerged.

되다 is the spontaneous, agentless counterpart of 하다. Think of 하다 as "do X" and 되다 as "X gets done / X comes to be." Watch the same noun flip between them:

The first sentence has an agent (제가, "I") who performed the booking. The second reports the outcome — the reservation exists now — without naming who did it. That is the whole distinction in miniature.

되다 as "get done / be ready"

The most common place learners slip is the resultative "it's ready / it's done." English lets you say "I prepared it" and "it's ready" with the same root, so learners produce 준비했어요 for both — but 준비했어요 means "I prepared it." To say the food itself is ready, you need the agentless 준비되다:

Put them next to each other and the logic is clear: 준비했어요 foregrounds you doing the preparing; 준비됐어요 foregrounds the state of being ready, doer unmentioned.

되다 as "get cancelled / start / happen"

Whenever something happens to a subject rather than being done by one, 되다 is the natural choice. English often marks this with "get + past participle" or an intransitive verb, and both map to 되다:

You could say 회의를 취소했어요 ("[someone] cancelled the meeting") if you want to foreground the canceller — but if the meeting is your subject and you're just reporting what happened to it, it's 취소됐어요. The choice of verb is really a choice of which participant is your subject.

걱정돼요: when the feeling happens to you

A subtler case is emotion. "I'm worried" feels like something you do, so learners say 걱정해요. But Korean often treats worry as something that arises in you — the situation worries you — which is 되다:

걱정해요 is not wrong, but it leans toward "I actively worry about it / I fret over it" (often about someone else: 부모님을 걱정해요, "I worry about my parents"). For the plain, welling-up feeling "I'm worried," the spontaneous 걱정돼요 is what natives reach for. The same pattern gives you 기대돼요 ("I'm looking forward to it," lit. "it excites anticipation in me") and 후회돼요 ("I regret it").

The spelling footnote: 되 + 어 → 돼

You'll have noticed the surface forms 돼요 and 됐어요. When an ending starting with 어/아 attaches to 되-, the two contract: 되 + 어 → 돼. That is a spelling minefield in its own right (되 vs 돼), and it has a dedicated page — see the 되다 spelling trap. Here, just note the pattern: 돼요, 됐어요, 돼서 all come from 되- plus an 어-ending.

Why English pushes you toward 하다

English leans hard on one verb — "do / make" — plus a "get / be + past participle" frame for results: "I did it," "it got done." Because the root often stays the same across active and resultative ("prepare" → "I prepared it" / "it's prepared"), English gives you no signal that a different verb is needed. Add to that the fact that 하다 is the first, most productive verb you learn, and the default is overwhelming: when in doubt, learners reach for 하다. Korean, by contrast, lexicalizes the agentless result as its own verb (되다), so the language forces a choice English never makes you make. The fix is to pause on your subject: if the subject is the thing undergoing the event rather than causing it, switch to 되다. For the broader picture of how 되다 forms passives, see 되다 as a passive and the 하다/되다 valency pair.

Common Mistakes

1. 준비했어요 for "it's ready." That sentence means "I prepared it." For the state, use 준비됐어요.

2. 취소했어요 for "it got cancelled." With the event as subject and no doer, use 취소됐어요.

3. 시작했어요 for the intransitive "it started." 영화가 시작했어요 is off; the movie is undergoing, not doing.

4. 걱정해요 for the welling-up feeling "I'm worried." For the spontaneous emotion, prefer 걱정돼요.

5. 예약했어요 when the reservation is the subject. If you mean "the booking went through," it's 예약됐어요.

Key Takeaways

• 명사+하다 = an agent actively does it (제가 준비했어요). 명사+되다 = it gets done / happens / comes about on its own (준비됐어요).
• 되다 is the spontaneous, agentless counterpart of 하다 — reach for it for "get done," "get cancelled," "start (intransitive)," and welling-up feelings (걱정돼요, 기대돼요).
• Diagnostic: if you can say "it gets/becomes X" with no doer, use 되다; if "someone does X," use 하다.
• The surface forms 돼요 / 됐어요 come from 되 + 어 → 돼 — its own spelling page.