Core Grammar Rule: ~고 나서
This pattern is used to clearly state that one action is completed before the next one begins. It emphasizes the sequence and completion.
Meaning & Usage
Meaning: It translates to "after doing (verb)..." or "and then...". It connects two actions chronologically, making it clear that the first action (V1) must finish before the second action (V2) starts. For example, 밥을 먹고 나서 약을 먹어요 means "After eating a meal, I take medicine." The eating must be finished first.
When to use: Use it when you want to be precise about the order of events. It's very common in daily conversation for describing routines, giving instructions, or making plans.
Conjugation Rules
Rule: It's very simple. Attach ~고 나서 directly to the verb stem, regardless of whether it ends in a vowel or a consonant. The verb 나다 (to occur/emerge) is part of the grammar itself, so you don't conjugate it. Simply remove ~다 from the first verb and add ~고 나서.
Verb Stem + ~고 나서: 먹다 → 먹고 나서 / 가다 → 가고 나서
Native Nuance: ~고 vs. ~고 나서
While both ~고 and ~고 나서 can connect actions, they have a subtle but important difference in nuance.
~고 나서: Emphasizing Completion and Sequence
Context: Use ~고 나서 when you want to stress that the first action is fully completed before the second one begins. It highlights a clear temporal separation. It's often used for actions that cannot happen simultaneously.
Example: 손을 씻고 나서 밥을 먹어요. (After washing my hands, I eat a meal.) This emphasizes that the hand-washing is a prerequisite.
~고: Simple Listing or Close Connection
Context: ~고 can be a simple "and" that lists actions, sometimes implying a very quick succession or even a connection between the two. In many cases, it's interchangeable with ~고 나서, but ~고 나서 is always clearer about the sequence. Avoid using ~고 나서 for actions that are very closely linked or happen almost at the same time, like 옷을 입고 학교에 가다 (put on clothes and go to school).
Example: 저는 아침에 일어나고 물을 마셔요. (I wake up in the morning and drink water.) This feels like a simple list of routine actions. Using 일어나고 나서 here is also correct but puts more emphasis on the act of getting up being fully complete.