Core Grammar Rule: ~지 그래(요)?
This grammar pattern is used to make a soft suggestion or give advice to someone. It literally translates to "Why don't you do...?", but it's used more like "It would be a good idea to..." It implies that the speaker thinks their suggestion is a reasonable and good course of action.
Meaning & Usage
Meaning: It's a way to gently recommend a certain behavior. While it's a question in form, it functions as a suggestion. It's softer than a direct command (~(으)세요) but can sometimes carry a very slight nuance of friendly complaint or chiding, like "Why aren't you doing this obvious thing?".
When to use: Use it with friends, colleagues you are close with, or people younger than you. It's generally not used with superiors or in very formal settings, as it can sound a bit too familiar or even slightly critical.
Conjugation Rules
Rule: Attach ~지 그래(요)? directly to the verb stem, regardless of whether it ends in a vowel or a consonant.
Examples:
가다 (to go) → 가지 그래(요)?
먹다 (to eat) → 먹지 그래(요)?
쉬다 (to rest) → 쉬지 그래(요)?
듣다 (to listen) → 듣지 그래(요)?
Verb Stem + ~지 그래(요)?
Native Nuance & Mistakes
While ~지 그래(요)? is a useful suggestion pattern, using it in the wrong context can sound awkward or even rude.
Don't Use It with Superiors
Context: Never use this pattern to suggest something to your boss, a professor, or an elderly person you're not close to. It implies a certain level of equality or seniority on the speaker's part. Suggesting "사장님, 먼저 퇴근하시지 그래요?" (Boss, why don't you leave work first?) would be considered rude. Instead, use a more honorific and indirect suggestion form like ~시는 게 어때요? (How about...?) or ~(으)시는 건 어떨까요? (How would it be if you...).
Example: To a boss: "먼저 퇴근하시는 게 어때요?" (How about you leave work first?).
It's Not for Brand New Ideas
Context: This pattern works best when the suggested action is a logical, common-sense solution to a problem the listener is facing. It's not typically used for proposing a wild, creative, or completely new idea out of the blue. It's more for situations like, "You look tired. Why don't you rest?" or "You're hungry. Why don't you eat something?".