Mastering Korean Grammar: -았어요/었어요 (Past Tense)
Today, we are learning how to talk about the past in Korean using -았어요/었어요.
This is the polite, informal past tense ending. It’s the standard way to describe things that have already happened in most everyday conversations.
It’s used to make statements (like “I ate” or “It was good”) and to ask questions (like “What did you do?”).
1. Usage: Understanding -았어요/었어요
This pattern’s main function is to end a sentence in the past tense. Just like -아요/어요, it belongs to the ‘polite informal’ speech style, 해요체 (haeyo-che), which is perfect for daily use.
Function 1: Making Statements about the Past
You use it to state a fact or describe an action or state that is finished.
- Korean: 밥을 먹었어요.
English: “I ate a meal.” - Korean: 날씨가 좋았어요.
English: “The weather was good.”
Function 2: Asking Questions about the Past
To ask a question, you do not change the form. You simply raise your intonation at the end of the sentence.
- Korean: 밥을 먹었어요? (said with a rising tone)
English: “Did you eat a meal?” - Korean: 어제 뭐 했어요?
English: “What did you do yesterday?”
2. Conjugation: How to Form -았어요/었어요
You attach this ending to the stem of a verb or adjective (the part you get after dropping -다).
Rule 1: Last vowel is ㅏ or ㅗ
If the last vowel of the stem is ㅏ or ㅗ, you add -았어요.
- 가다 (to go) → 가 + -았어요 = 갔어요 (The ‘ㅏ’ vowels merge)
- 보다 (to see) → 보 + -았어요 = 봤어요 (The ‘ㅗ’ and ‘ㅏ’ merge to ‘ᅪ’)
- 좋다 (to be good) → 좋 + -았어요 = 좋았어요 (Stem ends in a consonant, so you just attach it)
Rule 2: Last vowel is NOT ㅏ or ㅗ
If the last vowel is anything else (like ㅓ, ㅜ, ㅣ, ㅡ, etc.), you add -었어요.
- 먹다 (to eat) → 먹 + -었어요 = 먹었어요
- 읽다 (to read) → 읽 + -었어요 = 읽었어요
- 배우다 (to learn) → 배우 + -었어요 = 배웠어요 (The ‘ㅜ’ and ‘ㅓ’ merge to ‘ᅯ’)
- 마시다 (to drink) → 마시 + -었어요 = 마셨어요 (The ‘ㅣ’ and ‘ㅓ’ merge to ‘ㅕ’)
Rule 3: Stems ending in ㅡ
If the stem’s last vowel is ㅡ (like 예쁘다, 바쁘다), the ㅡ vowel is dropped. You then look at the vowel before it to decide which rule to follow.
- 바쁘다 (to be busy) → 바빴어요 (The vowel before ㅡ is ‘ㅏ’, so it follows Rule 1)
- 예쁘다 (to be pretty) → 예뻤어요 (The vowel before ㅡ is ‘ㅖ’, which is not ㅏ/ㅗ, so it follows Rule 2)
- 쓰다 (to write) → 썼어요 (There is no vowel before it, so it defaults to Rule 2)
Rule 4: 하다 Verbs (The Easy Rule)
All verbs ending in 하다 are special. They *always* become -했어요.
- 공부하다 (to study) → 공부했어요
- 일하다 (to work) → 일했어요
- 사랑하다 (to love) → 사랑했어요
Nouns: ‘Was’ (이었어요 / 였어요)
To say “I was a [noun]” or “It was a [noun],” you use the past tense of 이다 (to be).
- If the noun ends in a consonant: add -이었어요
Example: 학생 (student) → 학생이었어요. (I was a student.) - If the noun ends in a vowel: add -였어요
Example: 의사 (doctor) → 의사였어요. (He was a doctor.)
3. Example Sentences with -았어요/었어요
Here are 10 simple examples that cover all the rules.
- Korean: 어제 뭐 했어요?
English: What did you do yesterday? (하다 verb) - Korean: 저는 밥을 먹었어요.
English: I ate a meal. (Rule 2: -었어요) - Korean: 날씨가 정말 좋았어요.
English: The weather was really good. (Rule 1: -았어요) - Korean: 한국어를 공부했어요.
English: I studied Korean. (하다 verb) - Korean: 친구를 만났어요.
English: I met a friend. (Rule 1: 만나다 -> 만났어요) - Korean: 가방이 예뻤어요.
English: The bag was pretty. (Rule 3: 예쁘다 → 예뻤어요) - Korean: 어디에 갔어요?
English: Where did you go? (Rule 1: 가다 → 갔어요) - Korean: 저는 학생이었어요.
English: I was a student. (Noun + 이었어요) - Korean: 그 사람은 의사였어요.
English: That person was a doctor. (Noun + 였어요) - Korean: 주말에 아주 바빴어요.
English: I was very busy on the weekend. (Rule 3: 바쁘다 -> 바빴어요)
4. Key Rules and Comparisons
Here are a few crucial points to remember about this speech style.
Rule 1: Politeness Level (해요체)
-았어요/었어요 is the past tense version of 해요체 (Haeyo-che). It is polite and friendly, and you can use it in almost all everyday situations to talk about the past.
Rule 2: This is PAST Tense Only
This form *only* expresses the past tense. You cannot use it for the present or future.
- Present: 먹어요 (I eat / I am eating)
- Past: 먹었어요 (I ate)
- Future: 먹을 거예요 (I will eat)
Rule 3: Questions and Statements Look the Same
Remember, the only difference between a statement and a question is your tone of voice. This makes speaking very easy!
