How to Say “I Know” in Korean – Using Arayo and Araso

You might already know how to say “I don’t know” in Korean, but wouldn’t it be great also to know how to say “I know” in Korean? After all, there will be many situations where this expression could be convenient for you to know.

A boy with his finger up pointing towards a light bulb

Read on as we will teach you the different ways to say “I know” in Korean!

How to Say “I Know” in Korean

The infinite form of the expression is the verb “to know,” which in Korean is 알다 (alda). To turn it into an “I know,” you need to drop the 다 (da) and attach the proper conjugation depending on which level of formality the expression will be used.

Below is a guide on how to say “I know” in Korean, with examples of each level.

Formal “I Know” in Korean

When you want to say “I know” in Korean when speaking to native speakers older than you, or someone you’re not familiar with, you can refer to these words.

1. 압니다 (amnida)

The first one is the formal conjugation –ㅂ니다 (-ㅂ nida) simply attached to the base of the verb “know,” 알 (al). As part of the group of verbs with the stem ending in ㄹ, the ㄹ disappears when the ㅂ gets attached as part of the conjugation.

However, as the ㅂ is followed by ㄴ, it will be pronounced with an ㅁ-sound instead. You won’t hear 압니다 (amnida) being spoken much outside of presentations and equivalent situations, though.

Sample Sentence:

A: 이 사람을 압니까? (i sarameul amnikka)

Do you know this person?

B: 네, 압니다 (ne, amnida)

Yes, I do (know this person).

2. 알고 있습니다 (algo itseumnida)

알고 있습니다 (algo itseumnida) has a very similar meaning. However, with this type of conjugation, you are trying to convey that you know the topic you are currently discussing in a deep manner. It sounds more natural to use in speech, however, than 압니다 (amnida) does.

3. 알겠습니다 (algetseumnida)

알겠습니다 (algetseumnida) can also be used as an “I know” response in some situations, but often its meaning is closer in alignment with that of “I got it” rather than “I know,” so keep that in mind before using it.

Sample Sentence:

A: 이 사람을 알고 있습니까? (i sarameul algo itseumnikka)

Do you know this person?

B: 네, 알고 있습니다 (ne, algo itseumnida)

Yes, I do know this person.

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Standard “I Know” in Korean

Here are some standard ways of saying “I know” in Korean that you’ll hear most often.

1. 알아요 (arayo)

The most common way to say “I know” in Korean is 알아요 (arayo).

Notice that when the consonant ㄹ is followed by a vowel, in this case, ㅏ, the pronunciation of the letter is closer to an “r” as opposed to “l.”

Sample Sentences:

A: 이 책을 알아요? (i chaegeul arayo)

Do you know this book?

B: 네, 알아요. (ne, arayo)

Yes, I do know this book.

Here’s a video that explains how to say “I know” in Korean using 알아요 (arayo).

I KNOW in Korean - Made Simple!

In addition, if you attach the word 잘 (jal) in front of the verb, you can demonstrate that you know the topic well. For example, if you want to say that you speak Korean well, add 잘 (jal) in front of 알아요 (arayo), and you’re good to go!

2. 알고 있어요 (algo isseoyo)

Another standard way of saying “I know” 알고 있어요 (algo isseoyo). In this case, since ㄹ is followed by another consonant, it will be pronounced as “l” instead of “r.”

Informal “I Know” in Korean

Once you’ve become close to the person you are talking to, you can drop the 요 (yo) and speak informally like this.

1. 알아 (ara)

The informal way of saying “I know” in Korean is 알아 (ara). Note that you have to be careful if you speak to a stranger or a much older person (without getting their permission) using informal words because you’ll likely offend them.

However, a close friend or equivalent will be delighted to have you use the informal version.

Sample Sentence:

A: 이 영화 알아? (i yeonghwa ara)

You know this movie?

B: 응, 알아. (eung, ara)

Yeah. I know.

Now you know how to say “I know” in Korean! To further your knowledge of the verb 알다 (alda), here are some other similar usages of the word that might come into use soon.

“I got it” in Korean

You can say 알겠어요 (algesseoyo) or 알겠어 (algesseo) to convey that you understood or you got what the other person was saying.

Sample Sentence:

A: 선생님 말 이해했어요? (seonsaengnim mal ihaehaesseoyo)

Did you understand what the teacher said?

B: 네, 이제 알겠어요 (ne, ije algesseoyo)

Yes, I got it now.

“Okay” in Korean

Like the word above, 알았어요 (arasseoyo) also has a meaning close to saying that you understood what you just heard. It can also simply be used to mean “Okay.”

Depending on who you are speaking with, you can say “okay” in Korean as 알았습니다 (aratseumnida), 알았어요 (arasseoyo), or 알았어 (arasseo).

“Araso” in Korean

The word “araso” in Korean can also be used to express that you understand what the other person is saying. It is written as 알았어, so its Korean romanization is also often written as “arasseo.” This is an informal way of saying “okay” or “I know” in Korean.

Sample Sentence:

A: 나한테 나중에 전화해 (nahante najunge jeonhwahae)

Call me later.

B: 알았어 (arasseo)


Wrap Up

Now that you know how to say “I know” in Korean go out and tell people about what you know! You can also mix this up with other Korean words or phrases. How about learning different Korean nouns next? These will be easy and helpful additions to the Korean vocabulary that you know!

Want more Korean phrases? Go to our Korean Phrases Page for a complete list!

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17 thoughts on “How to Say “I Know” in Korean – Using Arayo and Araso”

  1. Hi, can 아지 also mean I know? I know that most of the time it is used for like “do you know.” But can it also mean “I know”?

      1. Hello,
        I’ve once heard someone say: 알어
        like: do you know that person? 이 사람을 알어?
        Can you maybe explain?

        Thank you very much! This article was very helpful!

        1. Hi, Anh! As you can see in the article, “알아(요)” is the standard form of the verb “알다” (to know) in spoken language. “알어” is a variation of “알아” and although it’s not the standard form, it’s still used very commonly in Korea. ^^

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