-아/어 주다: Doing Something as a Favor

In English you can say "Read it" and "Read it for me" with two separate words. Korean folds that "for me" straight into the verb by hanging the verb 주다 ("give") off the back of it. The result, verb + -아/어 + 주다, is the benefactive: it marks the action as done for someone's benefit, as a favor. This one pattern is so woven into everyday speech that a plain command without it — 만들어요 "make it" — sounds cold and transactional, while 만들어 주세요 "make it for me, please" sounds like a normal human request. Getting comfortable with 주다 is one of the fastest ways to stop sounding blunt.

The core idea: the action is a gift

Think of the favor literally as something you give. When you help someone, you give them your help; when you buy something for someone, you give them the purchase. Korean makes that giving explicit by tacking 주다 onto the main verb. The main verb takes its -아/어 form (the same infinitive stem you use for the present tense), and 주다 carries the tense and politeness.

Without 주다, each of those would still be grammatical — 도왔어요, 만들었어요, 가르쳐요 — but they would just report the action. Adding 주다 says the action was aimed at someone, done on their behalf. That extra layer of "for you" is the whole point.

Building the form: the -아/어 harmony

The connective is either -아 or -어, chosen by the last vowel of the stem — the same vowel harmony that governs the plain 해요체 present.

So 사다 (last vowel ㅏ) contracts to 사 and gives 사 주다; 읽다 (last vowel ㅣ) takes -어 for 읽어 주다; and every 하다 verb becomes 해 주다. Watch the irregular stems too: 돕다 is a ㅂ-irregular, so 돕 + 아 → 도와, giving the extremely common 도와주다.

Note on spelling: by the rule, the auxiliary 주다 is written as a separate word (읽어 주다), but a handful of high-frequency combinations are so lexicalized that Koreans routinely write them solid — 도와주다, 가르쳐주다, 갖다주다 (bring). Both spacings are accepted; you will see 도와줬어요 far more often than 도와 줬어요.

Requests live in -아/어 주세요

This is where the pattern earns its keep. A Korean request almost always ends in -아/어 주세요 ("please do X for me"), where 주세요 is the honorific-polite command of 주다 (주다 + -(으)세요). The 주다 is not optional politeness padding — it is what makes the sentence a request rather than an order. Strip it out and you are left barking instructions.

The little word 좀 ("a bit," softening the ask) and the ending 주세요 are a matched pair; you will hear them together constantly at shops, offices, and on the phone. English speakers, trained to think "please" alone carries the politeness, tend to drop the 주다 and produce 닫아요 — which lands like "Close it," not "Could you close it?"

Stacking status onto the favor: 주시다 and 드리다

Because the benefactive is built on the verb 주다, and 주다 is itself part of Korean's give-and-receive system, you can swap in the honorific or humble form of 주다 to show who is doing the favor for whom.

• -아/어 주시다 — someone graciously does it for me. The 주다 becomes 주시다 (주다 + honorific -시-), honoring the person who does you the kindness. This is why a story told to you by an elder is 읽어 주셨어요, not just 읽어 줬어요.
• -아/어 드리다 — I humbly do it for a superior. When you are the one performing the favor and the recipient outranks you, 주다 is replaced by the humble verb 드리다. 도와주다 → 도와드리다.

The direction is everything. If the favor flows up to you from someone higher, use 주시다 (honor the giver). If the favor flows up from you to someone higher, use 드리다 (humble your own act). Mixing these two up is the single most common honorific slip on this pattern.

When not to add 주다

Not every verb wants a benefactive. Actions that only affect the speaker, or that no one benefits from, sound odd with 주다: you would not say ×잤 주다 for "sleep." Reserve it for actions genuinely rendered for another party. And when you are simply describing what happened rather than framing it as a favor, the bare verb is right: 친구가 왔어요 "my friend came" needs no 주다, but 친구가 와 줬어요 adds "…and I'm grateful they made the effort for me." That gratitude nuance is real — 와 주다, 있어 주다 ("stay by me"), 살아 주다 are used precisely to thank someone for an act whose benefit is emotional.

Common Mistakes

Mistake 1: Dropping 주다 in a request. This is the big one. A bare -아/어요 aimed at someone reads as a curt order, not a request.

Mistake 2: Plain 주다 for a favor done to a superior. When you do the favor and the recipient outranks you, 주다 must become the humble 드리다.

Mistake 3: Using 드리다 when the superior does the favor for you. 드리다 only works when you are the one giving. If the honored person does you the kindness, use 주시다.

Mistake 4: Wrong vowel on the connective. The connective harmonizes with the stem's last vowel; 읽다 (ㅣ) takes -어, not -아.

Key Takeaways

• -아/어 주다 frames an action as a favor done for someone; the bare verb just reports it.
• The connective is -아 after ㅏ/ㅗ stems, -어 otherwise, and 해 for 하다 verbs; 주다 carries tense and politeness.
• Natural requests end in -아/어 주세요 — omit 주다 and you sound like you're giving orders.
• Swap 주다 for its relatives by social direction: 주시다 (someone kindly does it for me) and 드리다 (I humbly do it for a superior).
• Some benefactives (와 주다, 있어 주다) thank someone for an emotional kindness, not a material one.