Key Facts
- Hangul: 이해하다 (ihaehada)
- Meaning: to understand
- Part of speech: verb (동사)
- Level: A2
- Stem: 이해하
- Class: 하다 type
- Polite present: 이해해요
- Polite past: 이해했어요
- Formal present: 이해합니다
- Objects: transitive
What Does 이해하다 Mean?
- to understand. Used for grasping meaning or sympathizing with someone: 설명을 이해하다, 그 사람을 이해하다.
Particles. What you understand takes 을/를: 설명을 이해하다 (to understand an explanation). In the phrases 이해가 되다 and 이해가 안 되다, the noun 이해 takes 이/가 instead.
How Do You Pronounce 이해하다?
이해하다 is read as written, and its Revised Romanization is ihaehada. In casual speech the ㅎ sounds are often softened, but the standard reading keeps them. Sound changes appear only in some endings (standard pronunciation rules of the 국립국어원):
- 이해했어요 sounds like [이해해써요]
- 이해할 거예요 sounds like [이해할꺼예요]
- 이해하겠어요 sounds like [이해하게써요]
- 이해합니다 sounds like [이해함니다]
- 이해했습니다 sounds like [이해핻씀니다]
How Do You Use 이해하다 in a Sentence?
저는 한국어 문법을 이해해요.
I understand Korean grammar.
Form shown: polite present (이해해요).
선생님 설명을 이해했어요.
I understood the teacher's explanation.
Form shown: polite past (이해했어요).
그 사람을 이해하고 싶어요.
I want to understand that person.
Form shown: want to, polite (이해하고 싶어요).
Ihaehada Conjugation: What Are the Forms of 이해하다?
이해하다
| Form | Korean | Romanization | Rule |
|---|---|---|---|
| Polite present | 이해해요 | ||
| Polite past | 이해했어요 | ||
| Polite future (plan) | 이해할 거예요 | ||
| Polite future (intention or guess) | 이해하겠어요 | ||
| Formal present | 이해합니다 | ||
| Formal past | 이해했습니다 | ||
| Formal future | 이해할 것입니다 | ||
| Casual present | 이해해 | ||
| Casual past | 이해했어 | ||
| Casual future | 이해할 거야 | ||
| Want to (polite) | 이해하고 싶어요 | ||
| Honorific polite | 이해하세요 | ||
| Because / and then | 이해해서 | ||
| If (conditional) | 이해하면 | ||
| Present modifier (before a noun) | 이해하는 | ||
| Past modifier (before a noun) | 이해한 | ||
| Future modifier (before a noun) | 이해할 | ||
| Negative with 안 (short) | 이해 안 해요 | ||
| Negative (long form) | 이해하지 않아요 |
| Form | Korean | Pronunciation |
|---|---|---|
| Polite present | 이해해요 | as written |
| Polite past | 이해했어요 | [이해해써요] |
| Polite future (plan) | 이해할 거예요 | [이해할꺼예요] |
| Polite future (guess) | 이해하겠어요 | [이해하게써요] |
| Formal present | 이해합니다 | [이해함니다] |
| Formal past | 이해했습니다 | [이해핻씀니다] |
| Formal future | 이해할 것입니다 | [이해할꺼심니다] |
| Casual present | 이해해 | as written |
| Casual past | 이해했어 | [이해해써] |
| Casual future | 이해할 거야 | [이해할꺼야] |
| Want to (polite) | 이해하고 싶어요 | [이해하고 시퍼요] |
| Honorific polite | 이해하세요 | as written |
| Because / and then | 이해해서 | as written |
| If (conditional) | 이해하면 | as written |
| Present modifier | 이해하는 | as written |
| Past modifier | 이해한 | as written |
| Future modifier | 이해할 | as written |
| Short negative | 이해 안 해요 | as written |
| Long negative | 이해하지 않아요 | [이해하지 아나요] |
Is 이해하다 Regular or Irregular?
이해하다 is a regular 하다 verb: before an ending that starts with 아/어, 하 becomes 해, giving 이해해요 and 이해했어요. Lesson: 하다 to 해요. Tool: conjugator.
What Is the Most Common Mistake with 이해하다?
Wrong: ✗ 이 문법을 이해가 안 해요
Correct: ✓ 이 문법이 이해가 안 돼요 / 이 문법을 이해 못 해요
Why: This mixes two patterns. Either make the grammar the subject with 이해가 안 되다 (it doesn't make sense to me), or keep it as the object and say you can't understand it with 못: 이해 못 해요. 이해가 안 하다 is not possible.
Related lesson: negating 하다 verbs.
How Is 이해하다 Different from Similar Words?
| Word | How it differs from 이해하다 |
|---|---|
| 알다 | 알다 is to know; 이해하다 is to grasp the meaning or reason. |
| 알아듣다 | 알아듣다 is to understand what is said; 이해하다 is broader, including logic and feelings. |
Checking an Explanation in Class
A teacher checks whether an explanation made sense. The learner confirms one part and asks to understand the reason behind another.
Teacher
이 설명을 이해했어요?
I seolmyeongeul ihaehaesseoyo?
Did you understand this explanation?
Learner
네. 이 부분은 이해해요.
Ne. I bubuneun ihaehaeyo.
Yes. I understand this part.
Teacher
다른 질문이 있어요?
Dareun jilmuni isseoyo?
Do you have another question?
Learner
네. 이유도 이해하고 싶어요.
Ne. Iyudo ihaehago sipeoyo.
Yes. I want to understand the reason too.
이해했어요 asks whether understanding followed the explanation. 이해해요 reports the learner's current grasp of one part, while 이해하고 싶어요 asks for deeper understanding. The learner can understand an example without yet understanding why the rule works.
Understanding Information and Understanding People
설명을 이해하다 concerns the meaning of an explanation. 상황을 이해하다 means understanding a situation. 그 사람을 이해하다 often means seeing why a person feels or acts as they do. The same verb can therefore concern logic, circumstances, or sympathy.
Understanding a person does not necessarily mean agreeing with every action they take. In a difficult conversation, 이해해요 may acknowledge their perspective. If someone needs to know whether you agree to a proposal, a reply about understanding alone can leave that decision unclear.
Compare learning a fact with understanding a reason. 알다 can tell someone that you know the meeting time. 이해하다 is more suitable when you grasp why the meeting was moved. The difference is useful even when both verbs could be translated loosely as “I get it.”
Phrases That Change the Focus
| Expression | Literal idea | Meaning in use |
|---|---|---|
| 이해가 되다 | understanding happens | Something makes sense to someone. |
| 이해가 안 되다 | understanding does not happen | Something does not make sense. |
| 이해해 주세요 | please understand | Ask for patience or understanding about a situation. |
| 서로 이해하다 | understand each other | Recognize each other's feelings or perspective. |
이해해 주세요 often appears after an explanation of a delay, restriction, or personal difficulty. Its social purpose is to ask the listener to accept the circumstances with understanding. It is not normally a request to demonstrate that they understood a grammar lesson.
서로 means “each other.” Without it or a clear context, 이해하다 does not automatically express mutual understanding. One person can understand another even when that understanding is not returned.
Where Will You Hear 이해하다?
In class, a teacher may use 이해했어요 to check whether an explanation reached the learner. A learner who needs help can use 이해가 안 돼요. That reports a difficulty making sense of the material, rather than suggesting unwillingness to engage with it.
In customer service, 이해해 주세요 may accompany an explanation of an inconvenience. In a personal conversation, 이해해요 can show sympathy. The setting changes what is being understood, so listen for whether the topic is an instruction, a problem, or someone's feelings.
Formal 이해합니다 suits a serious acknowledgment in a meeting or written reply. Polite 이해해요 fits ordinary conversation. Neither form, on its own, proves that the speaker agrees, consents, or will follow the proposal.
Two 해 Syllables with Different Jobs
In 이해해요, the first 해 belongs to the noun 이해. The second comes from conjugating 하다 to 해요. Keep both when forming the polite present. In the past 이해했어요, the conjugated part becomes 했어요 while the noun remains 이해.
The negative requires a meaning choice. 이해 안 해요 is grammatical but can suggest not trying or choosing not to understand. 이해 못 해요 describes inability. 이해가 안 돼요 presents the material as something that does not make sense to you. For a puzzled learner, those last two are usually more helpful.
The marker changes: 설명을 이해하다 uses an object; 이해가 되다 uses the noun 이해 with 가. Mixing those patterns produces the common error shown earlier. Choose the whole expression before choosing its particles.
| Related word | Meaning | Useful note |
|---|---|---|
| 설명 | explanation | Often the thing you understand or ask to hear again. |
| 이유 | reason | What you want when an example alone is not enough. |
| 질문 | question | The next step when part of the explanation is unclear. |
| 오해 | misunderstanding | A mistaken interpretation, rather than no understanding at all. |
The classroom vocabulary lesson teaches words for asking about explanations and questions.
Mini Drill: Make the Meaning Clear
- Give the polite present of 이해하다.
- Give its polite past.
- Choose 이해가 안 돼요 or 이해 안 해요 for material that does not make sense to you.
- Complete “understand the explanation”: 설명____ 이해하다.
Show drill answers
- 이해해요, keeping both 해 syllables.
- 이해했어요.
- 이해가 안 돼요.
- 설명을 이해하다.
Quick Self-Test
- Does 이해해요 always mean “I agree”?
- What does 서로 add to 이해하다?
- Does 이해해 주세요 usually ask a listener to take a comprehension test?
Show answers
- No. Understanding and agreement can differ.
- Mutual understanding: understanding each other.
- No. It often asks for patience or understanding of circumstances.
Frequently Asked Questions
Is 이해하다 Regular or Irregular?
이해하다 is a regular 하다 verb. The polite present is 이해해요 and the polite past is 이해했어요.
How Do You Say "I Understand Korean Grammar" in Korean?
Say 저는 한국어 문법을 이해해요. The verb is in the polite present form, 이해해요.
How Do You Say "I Don't Understand" with 이해하다?
The most natural options are 이해가 안 돼요 (it doesn't make sense to me) and 이해 못 해요 (I can't understand it). The plain negatives 이해 안 해요 and 이해하지 않아요 exist, but they sound like you are choosing not to understand.
How Do You Say "I Want to Understand" with 이해하다?
Add 고 싶어요 to the stem: 이해하고 싶어요, as in 그 사람을 이해하고 싶어요 (I want to understand that person).
Which Particles Go with 이해하다?
What you understand takes 을/를: 설명을 이해하다. In 이해가 되다 and 이해가 안 되다, 이해 takes 이/가.
What Is the Difference between 이해하다 and 알다?
알다 is to know something; 이해하다 is to grasp its meaning or the reason behind it.
Which Words Are Related to 이해하다?
What Should You Learn Next?
Next, compare 알다 (to know) and 알아듣다 (to catch what someone says). Or browse the verb dictionary.