Core Pattern Rule: -아/어/여 줄게
This pattern is used to offer to do something for someone else. It translates to "I'll do [verb] for you," expressing a helpful intention or a promise to perform an action for the listener's benefit.
Formation
Attach -아/어/여 줄게 to a verb stem. The choice of -아, -어, or -여 depends on the verb's final vowel, just like the standard -아/어/여요 conjugation.
Verb stem ends in ㅏ or ㅗ: Add -아 줄게.
보다 (to see/watch) → 봐 줄게 (I'll watch it for you.)
사다 (to buy) → 사 줄게 (I'll buy it for you.)
Verb stem ends in other vowels: Add -어 줄게.
먹다 (to eat) → 먹어 줄게 (I'll eat it for you.)
들다 (to carry) → 들어 줄게 (I'll carry it for you.)
하다 verbs: These become -해 줄게.
요리하다 (to cook) → 요리해 줄게 (I'll cook for you.)
Core Meaning
The key is the verb 주다 (to give), which here adds the nuance of "doing something for someone's sake." The ending -ㄹ게 expresses the speaker's will or intention, making it a personal promise or offer.
내가 다 먹어 줄게. / 내가 들어 줄게. / 도와줄게. / 해 줄게.
Nuance & Alternatives: -줄게 vs. -줄까? vs. -ㄹ게
Choosing the right ending is crucial for sounding natural. -아/어/여 줄게 is an offer, but small changes create very different meanings.
-아/어/여 줄게 (The Confident Offer)
This is a statement or a promise. You use it when you've decided to help and are informing the other person. It's assertive and reassuring.
Usage: 기다려 줄게. (I'll wait for you. — A firm promise.)
-아/어/여 줄까? (The Questioning Offer)
This turns the offer into a question: "Shall I do... for you?" or "Do you want me to...?" It's softer and gives the listener a chance to accept or decline. It's often used when you're unsure if your help is needed or wanted.
Usage: 기다려 줄까? (Shall I wait for you?)
-ㄹ/을게 (Simple Intention)
This ending just states your intention to do something, without the nuance of it being a favor for the listener. The action primarily concerns the speaker.