-아/어 주다: Doing Something For Someone (and Requests)

Korean has a way to say, in a single verb, "I did this for you." Take any action verb, put it in its -아/어 form, and attach 주다 "to give": the result means the action was done for someone's benefit. 사다 "buy" becomes 사 주다 "buy for someone"; 읽다 "read" becomes 읽어 주다 "read to / for someone." This little construction is one of the most frequently used patterns in the language — and it is the engine behind the everyday polite request 문 좀 열어 주세요 "please open the door."

The reframing to hold onto: where English tacks "for me / for you" on as an extra phrase, Korean grammaticalizes the beneficiary inside the verb. That difference is why leaving 주다 off a request can quietly turn a polite ask into a bare command.

The form: -아/어 form + 주다

The connective is the ordinary -아/어 vowel-harmony rule you already use for the past tense and the -어요 present: -아 after a stem whose last vowel is ㅏ or ㅗ, -어 elsewhere, and 하다 → 해.

돕다 "help" is worth noting: it is a ㅂ-irregular (돕 + 아 → 도와), and 도와주다 has fused into a single dictionary word — you'll see it written solid. For most verbs, though, the auxiliary is written with a space: 사 주다, 읽어 주다.

Both sentences carry a warmth English has to add separately ("for me," "to me"). In Korean it's already there, in 주다.

The neutral verb vs the benefactive

Compare a bare action with its benefactive twin. 사요 is neutral "(someone) buys"; 사 줘요 explicitly means "buy it for someone." The 주다 is what tells the listener there's a beneficiary in the picture.

That second one is a perfect example: 태우다 alone is just "give a ride / carry"; 태워 주다 frames it as a favor done for the speaker.

The high-frequency use: requests with -아/어 주세요

By far the most common place you'll use this pattern is polite requests. -아/어 주다 + the honorific ending -세요 gives -아/어 주세요, the standard "please do (for me)." 좀 "a little / please" is often slipped in to soften it further.

The reason this matters: 문 좀 열어 주세요 and 문 좀 여세요 are not equally polite. 여세요 is a bare honorific command ("open the door"); 열어 주세요 asks the listener to do it as a favor to you. The benefactive 주다 is doing real social work — it turns an instruction into a request.

Softer still: -아/어 주시겠어요?

To be even more deferential, add the honorific -시- and the modal -겠- and turn it into a question: -아/어 주시겠어요? "would you (be willing to) do (for me)?" This is the register of asking a stranger or a superior for a favor.

There is a whole ladder of politeness for requests — from blunt -아/어 줘 up through -아/어 주시겠어요 — laid out on the 주세요 requests page.

The humble and honorific partners

The beneficiary's status changes which "give" verb you use. When you do a favor for a superior, you humble your own action with -아/어 드리다 (드리다 = humble "give"). When a superior does a favor for you, their action is honorified with -아/어 주시다 (주다 + -시-). Same benefactive frame, three social directions:

The humble 드리다 branch has its own page; the choice between 주다 and 드리다 is one of the most common places learners slip, so it's worth studying as a pair.

How this differs from English

English expresses benefit with a preposition ("buy a gift for her") or a double object ("buy her a gift"), and both are optional flourishes — "I bought a gift" is a complete, natural sentence. Korean's -아/어 주다 is neither a preposition nor optional decoration: it's an auxiliary verb welded onto the main verb, and in the request register it's nearly obligatory. An English speaker who mentally files "for me" as an add-on tends to drop 주다 and produce commands that land as brusque. The fix is to stop translating "please" as a word and start hearing it as structure — the -아/어 주다 frame is the politeness.

Common Mistakes

1. Omitting 주다 in a request, producing a command. The most consequential error — it doesn't break grammar, it breaks tone.

2. Attaching 주다 to the bare stem instead of the -아/어 form. The connective is not optional.

3. Picking the wrong harmony vowel. 만들다's last stem vowel is ㅡ (not ㅏ/ㅗ), so it takes -어, giving 만들어, never ×만들아.

4. Using 주다 when the beneficiary outranks you. A favor for a superior is humbled with 드리다, not 주다.

5. Honorifying your own benefactive action. When you are the one giving the favor, you never put -시- on 주다 for yourself.

Key Takeaways

• -아/어 form + 주다 = "do the action for someone's benefit." Korean folds the beneficiary into the verb.
• The connective follows normal -아/어 harmony (사 주다, 읽어 주다, 만들어 주다, 도와주다).
• The dominant use is requests: -아/어 주세요 "please do (for me)," and the softer -아/어 주시겠어요?
• Dropping 주다 from a request turns it into a command — the benefactive is the politeness.
• Status shifts the "give" verb: 주다 (neutral), 드리다 (you → superior, humble), 주시다 (superior → you, honorific).