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Why Korean verbs and adjectives end with “-다(da).”

12/29/2025

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English
[종합 정리] 한국어 동사·형용사가 “-다”로 끝나는 이유
한국어 동사와 형용사는 ‘어간(몸통) + 어미(꼬리)’로 이루어지고, 사전에는 가장 중립적인 꼬리인 “-다”를 붙인 기본형으로 올립니다.
[Full Summary] Why Korean verbs & adjectives end with “-da”
Korean verbs and adjectives are built as “stem (body) + ending (tail),” and dictionaries list the base form by attaching the most neutral ending: “-da.”
English
1단계: 한국어 단어의 구조 (몸통과 꼬리)
한국어의 동사(움직임)와 형용사(상태)는 한 덩어리가 아닙니다. 레고 블록처럼 두 부분으로 나뉩니다.
  • 어간(몸통): 뜻을 담당하며 절대 변하지 않는 부분 (예: 먹-, 예쁘-)
  • 어미(꼬리): 기능을 담당하며 계속 바뀌는 부분 (예: -다, -고, -요)
  • 핵심: 몸통인 ‘어간’은 혼자서는 말을 못 합니다. 반드시 뒤에 ‘꼬리(어미)’가 붙어야 비로소 단어가 됩니다.
Step 1: How Korean words are built (a body and a tail)
In Korean, verbs (actions) and adjectives (states) aren’t a single solid block. Like Lego pieces, they split into two parts.
  • Stem (body): carries the meaning and doesn’t change (e.g., meok- “eat-”, yeppeu- “pretty-”)
  • Ending (tail): carries the function and changes constantly (e.g., -da, -go, -yo)
  • Key point: A stem can’t “speak” by itself. Only when an ending attaches does it become a complete word form.
English
2단계: 한국어의 특징 ‘활용’ (무한 변신)
한국어는 상황에 따라 꼬리를 계속 갈아 끼우는 언어입니다. 이것을 ‘활용’이라고 합니다.
  • 밥을 먹고 (연결)
  • 밥을 먹으니 (이유)
  • 밥을 먹어서 (원인)
  • 밥을 먹어요 (존대)
Step 2: The Korean feature “conjugation” (endless transformations)
Korean keeps swapping the “tail” depending on the situation. This is called conjugation.
  • I eat rice and then…: meok-go (linking)
  • Since I eat…: meok-euni (reason)
  • Because I ate…: meok-eoseo (cause)
  • I eat (polite): meok-eoyo (politeness)
English
3단계: 문제 발생 (사전에 뭘 싣지?)
단어 하나가 수십, 수백 가지로 변신합니다. 그런데 사전(Dictionary)에 이 모든 변화 형태를 다 실을 수는 없습니다. 책이 너무 두꺼워질 테니까요.
그래서 우리는 “변하기 전, 가장 기초가 되는 대표 형태 하나만 싣자!”라고 약속해야 했습니다. 이것이 ‘기본형(Dictionary Form)’입니다.
Step 3: The problem (What do we put in a dictionary?)
One word can transform into dozens or even hundreds of forms. But a dictionary can’t list every single variation—otherwise it would become enormous.
So we agree: “Let’s list just one representative, most basic form before the changes.” That is the dictionary form (base form).
English
4단계: 해결책 (왜 하필 ‘-다’인가?)
그 대표 꼬리로 선택된 것이 바로 “-다”입니다. 이유는 가장 공평하고 중립적이기 때문입니다.
  • -요는 너무 공손하고,
  • -어는 너무 버릇없고,
  • -니는 질문하는 것이고,
  • -자는 권유하는 것입니다.
반면에 -다는 감정이 없습니다. 존대도, 하대도 아닌 ‘객관적인 사실(팩트)’만 딱 건조하게 전달합니다. 그래서 “이 단어의 이름은 이것이다”라고 소개하는 사전에 가장 잘 어울리는 꼬리가 된 것입니다.
Step 4: The solution (Why “-da” specifically?)
The representative “tail” chosen is “-da.” It’s the most fair and neutral.
  • -yo is too polite,
  • -eo can sound too casual/rough,
  • -ni is a question form,
  • -ja is a suggestion (“let’s”).
But -da carries no social attitude. It simply states an objective fact. That’s why it fits best for dictionaries when we “name” a word in its base form.
English
5단계: 형용사도 껴주는 이유
영어와 달리 한국어는 형용사(예쁘다, 좋다)도 동사처럼 꼬리가 계속 변합니다(예쁘고, 좋으니). 문법적 성질이 동사와 똑같기 때문에, 형용사도 똑같이 “-다”를 붙여서 사전에 올립니다.
Step 5: Why adjectives are included too
Unlike English, Korean adjectives (e.g., “pretty,” “good”) also change their endings like verbs (e.g., yeppeu-go, joh-euni). Since they behave like verbs grammatically, adjectives are also listed in dictionaries with the same “-da” base form.
English
□ 최종 비유: “마트와 요리” (Aha! 포인트)
1) 사전 = 마트 진열대
마트에는 식재료가 ‘포장된 상태’로 진열되어 있습니다.
  • 이것이 바로 가다, 먹다, 예쁘다 (기본형)입니다.
  • 여기서 -다는 상품을 보호하는 ‘포장지’입니다.
2) 대화 = 요리해서 먹기
우리는 포장지(-다)를 뜯지 않고 그대로 먹지 않습니다. 포장지(-다)를 뜯어내고, 상황에 맞게 요리(-요, -습니다, -어 등을 붙임)를 해서 내놓습니다.
□ Final Analogy: “The grocery store & cooking” (Aha! point)
1) Dictionary = store shelf
On a store shelf, ingredients are displayed in a packaged form.
  • That “packaged form” is the base form: gada, meokda, yeppeuda.
  • Here, -da is like the packaging that protects the product.
2) Conversation = cooking and serving
We don’t eat the packaging (-da) as-is. We unwrap it and “cook” the word for the moment by attaching endings like -yo, -seumnida, -eo, and so on.
English
결론
“한국어의 모든 동사와 형용사는 ‘몸통’만으로는 살 수 없어서 반드시 ‘꼬리’가 필요한데, 사전에 올릴 때 감정이 섞이지 않은 가장 중립적인 포장지(꼬리)인 ‘-다’를 붙여놓기로 약속했기 때문이다.”
Conclusion
“All Korean verbs and adjectives can’t stand alone as just a ‘body’ (stem)—they must have a ‘tail’ (ending). And when listing them in a dictionary, we attach the most neutral, emotion-free ‘packaging’ ending, ‘-da,’ by convention.”
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Final ending (어말어미)

7/7/2024

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Final ending(어말어미) is not just a theoretical concept, but a practical tool in Korean grammar. It's an ending that comes at the end of a verb, adjective, or predicate particle when it is conjugated. There are connective endings(연결어미) that connect to the next word, transformative endings(전성어미) that change the part of speech, and final endings(종결어미) that conclude the sentence. These final endings are essential for forming complete sentences in Korean and conveying meaning effectively.
  1. Connective endings (연결 어미): These endings connect to the next word, allowing for the creation of complex sentences and phrases.
    Ex) "-고" (and) - 나는 밥을 먹고 친구를 만났다. (I ate rice and met my friend.)
  2. Transformative endings (전성 어미): These endings change the part of speech of the word they are attached to, allowing for flexibility in sentence construction.
    - Noun transformative endings (명사형 전성 어미)
      Ex) "-ㅁ/음"
      그의 꿈은 세계 여행을 하는 것이다. (His dream is to travel around the world.)  꾸다(Verb) --> 꿈(Noun)              그의 울음은 나를 슬프게 했다. (His crying made me sad.) 울다(Verb) --> 울음(Noun)    
  3. - Determiner/Unconjugated adjective transformative endings (관형사형 전성 어미) 
      Ex) "-ㄴ/은"
      예쁜 꽃이 피었다. (A pretty flower bloomed.)                                                                                                              예쁘다(Adjective) --> 예쁜(Determiner adjective)                                                                                                        적은 돈이라도 아껴 쓰세요. (Even if you have a small amount of money, save it.)                                                      적다(Adjective) --> 적은(Determiner adjective)
    -  Adverbial transformative endings (부사형 전성 어미)
       Ex) "-게"
       그는 빠르게 달린다. (He runs fast.)
    These transformative endings allow you to change the part of speech of a word, making it easier to express complex ideas and nuances in Korean.
  4. Sentence endings (종결 어미): These endings conclude the sentence, expressing various moods, tenses, and attitudes.
    Ex) "-습니다" (polite declarative sentence ending) - 저는 한국어를 공부합니다. (I study Korean.) 
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The stem and ending of predicates

6/4/2024

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Let's study the sentence, “안녕하세요, 오늘 날씨가 정말 좋네요.”
The base form or dictionary form of "안녕하세요" is "안녕하다".
Korean verbs and adjectives are formed by combining a word's stem and an ending.
Unlike English adjectives, Korean adjectives have a descriptive function similar to verbs.

In Korean, "안녕하세요" is an adjective.

The "안녕하-" in "안녕하세요" is the stem, which is the part that doesn't change when the adjective is conjugated.
In "안녕하세요," "-세요" is an interrogative ending of ordinary honorifics as 안녕하세요 is asking the other person's status politely.

"가" in "날씨가" is a subjective particle that tells us that the weather is the subject of the sentence.

The base form of "좋네요" is "좋다."
The stem of 좋네요 is "좋," and "네요" is an exclamatory sentence final ending. The final ending of exclamatory sentences in Korean is 감탄형 종결어미, and the interrogative ending of ordinary honorifics is 예사 높임의 의문형 종결 어미.
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띄어쓰기 (Word Spacing)

8/9/2023

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In written Korean, the correct spacing between words is essential in order to send the right message.

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활용 (Conjugation)

8/8/2023

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In Korean, the process of changing the form of verbs and adjectives to express different grammatical meanings or functions is called 활용 (Conjugation). This is achieved by attaching various elements called 어미(ending) to the 어간(stem). 어간 does not change when conjugated. 어간 and 어미 can be separated into distinct units, and 어간 generally have a consistent form. The combination of 어간 and 어미 allows verbs and adjectives to convey a wide range of grammatical meanings and functions.

Terminology:
  • 활용 (Conjugation) refers to the conjugation of verbs and adjectives in Korean.
  • 어미 (ending) is the ending attached to the 어간 (stem) of verbs and adjectives to change their form.
  • 어간 (stem) is the stem of a verb or adjective.
  • The combination of 어간 and 어미 allows for a variety of grammatical meanings and functions.
Examples:
  • 먹다  - to eat
  • 먹어요 - I eat (polite)
  • 먹었어요  - I ate (polite)
  • 먹을거예요 - I will eat (polite)


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The structure of Korean sentences.

8/8/2023

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There are five basic Korean sentence structures. ​
S1) Subject+ Predicate (S+P).
토끼가 뛴다.
​
A rabbit jumps.​
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S2) Subject + Adverb+ Predicate (S+A+P).
토끼가 높이 뛴다.
​The rabbit jumps high. 
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S3) Subject + Object + Predicate (S+O+P).
토끼가 풀을 먹는다.
The rabbit eats grass. ​
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S4) Subject + Complement + Predicate (S + C +P).
토끼는 새가 아니다.
The rabbit is not a bird. ​
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S5) Subject + Object + Adverb + Predicate (S+O+A+P).
토끼가 풀을 많이 먹는다.
The rabbit eats grass a lot.
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품사 (Parts of speech)

8/8/2023

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품사는 문법적 관점에서 단어들이 가지고 있는 공통성을 기준으로 단어들을 분류한 유형입니다.
​Parts of speech are the types of words categorized based on the commonalities they have from a grammatical point of view.

한국어에서 쓰이는 모든 단어는 명사, 대명사, 동사, 형용사, 부사, 감탄사, 관형사, 수사, 조사 등 9 품사로 분류됩니다.
All words used in Korean can be categorized into 9 parts of speech: noun, pronoun, verb, adjective, adverb, interjection, pre-noun, numeral, and postposition.
반면에 영어 단어들은 명사, 대명사, 동사, 형용사, 부사, 감탄사, 접속사, 전치사 등 8 품사로 분류됩니다. 
On the other hand, English words are categorized into eight parts of speech: noun, pronoun, verb, adjective, adverb, interjection, conjunction, and preposition.
명사, 대명사, 동사, 형용사, 부사, 감탄사는 한국어와 영어에서 모두 공통되는 품사입니다.
Nouns, pronouns, verbs, adjectives, adverbs, and interjections are common parts of speech in both Korean and English.
한국어는 언어의 특성상, 관형사와 조사라는 품사가 있습니다.
Due to the nature of Korean language, there are parts of speech called pre-noun and postposition.
​관형사는 명사, 대명사, 및 수사 앞에 놓여 이런 명사들을 수식합니다. 관형사는 형용사처럼 활용되지 않습니다.
Pre-nouns are placed before nouns, pronouns, and numerals to modify these words. Pre-nouns are not conjugated like adjectives.
​영어의 전치사는 단어 앞에 붙지만, 조사는 단어 뒤에 붙습니다.
​In English, prepositions are placed before words, whereas particles are placed after words.
조사는 명사, 대명사, 수사, 부사 뒤에 위치하여 그 단어들을 수식합니다. 
Postpositions are placed after nouns, pronouns, numerals, and adverbs and modify them. ​
한국어 문장에는 단어 사이에 공백이 있습니다. 그러나 단어와 조사 사이에는 공백이 없습니다.
In a Korean sentence, there is a space between words. But there is no space between a word and a postposition.
다른 단어들과는 달리 조사라는 단어는 문장에서 단독으로 사용될 수 없습니다. 
Unlike other words, the word postposition can not be used alone in the sentence. ​
조사는 문장안에서 단어를 주어나 목적어로 만듭니다. 또한, 조사는 단어에 특별한 의미를 부여하거나 단어 사이의 접속사 역할을 합니다.
Postpositions make the words a subject or an object in the sentence. 
Also, postpositions add a special meaning to the words, or work as a conjunction between words.
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