V+더니

Overview

V+더니 is a versatile connective ending used to link a past observation or experience made by the speaker to a subsequent event, state, or change in the present or future. It highlights that the speaker directly witnessed the initial situation and is now reporting a consequence, a change, or a sequential event based on that observation.

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Usage

This grammar pattern serves several key functions:

1. Expressing a Result or Consequence of a Past Observation: The speaker observed an action or state in the past, and now reports what happened as a direct result or consequence.
   • Example: 아이가 아침부터 울더니 결국 열이 났어요. (The child cried since morning, and as a result, eventually developed a fever.)
2. Indicating a Change or Contrast from a Past State: The speaker observed a certain state in the past, but now that state has changed. This often implies a contrast.
   • Example: 작년에는 조용하더니 올해는 아주 시끄러워졌네요. (It was quiet last year, but this year it has become very noisy.)
3. Connecting Sequential Actions or Events: The speaker observed one action, and then another action followed immediately or as a direct progression.
   • Example: 친구가 문을 열고 들어오더니 바로 앉았어요. (My friend opened the door and came in, and then immediately sat down.)

Important Note: The subject of the first clause (the one with -더니) is typically not the speaker. If the speaker is the subject, it usually implies a habitual action or a general truth, or the speaker is reporting their own past action that led to a current state/feeling (though -았/었더니 is more common for the latter).

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Conjugation Rules

V+더니 attaches directly to the stem of a verb or an adjective. There are no special rules for vowel or consonant endings.

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Knowledge Plus

• V+더니 vs. V+았/었더니:
  • V+더니: Used when the speaker observed someone else's action or state in the past and reports a result or change. The subject of the first clause is usually not the speaker.
    • Example: 아이가 울더니 잠이 들었어요. (The child cried, and then fell asleep.) - Speaker observed the child.
  • V+았/었더니: Used when the speaker themselves performed an action in the past and observed the result or consequence. The subject of the first clause is always the speaker.
    • Example: 내가 울었더니 눈이 부었어요. (I cried, and as a result, my eyes are swollen.) - Speaker performed the action.
• Tense with 더니: 더니 itself implies a past observation. Therefore, it typically attaches to the present tense verb/adjective stem. Using 았/었더니 (e.g., 했더니) is for when the speaker is the subject and performed an action.
• Subject Constraint Revisited: While the first clause subject is usually not the speaker, it can be the speaker if it describes a habitual action or a general truth/feeling that the speaker experienced, leading to a current state.
  • Example: 내가 어렸을 때는 키가 작더니 지금은 많이 컸어요. (When I was young, I was short, but now I've grown a lot.) - Speaker's past state leading to present change.
  • Example: 나는 어제 술을 많이 마시더니 오늘 머리가 아파요. (I drank a lot yesterday, and today my head hurts.) - Speaker's past action leading to present state. (Here, 마셨더니 would be more common, but 마시더니 is also possible, emphasizing the observation of the drinking leading to the headache.)