Find the stem
Remove 다 from the dictionary form. For 듣다, the stem is 듣-.
Korean grammar guide
Korean irregular verbs and adjectives, explained for learners.
Korean verbs and descriptive verbs change when endings are attached. Most follow a predictable pattern, but common stems such as 듣다, 쉽다, 낫다, 빠르다, 그렇다, and 살다 need special attention.
What "irregular" means in Korean
In Korean, verbs and descriptive verbs attach endings for tense, politeness, connection, and sentence mood. An irregular pattern happens when the final part of the stem changes before certain endings, especially vowel-starting endings like 아/어요.
Check the next ending
Many irregulars change before endings that begin with a vowel, but not before every ending.
Use the natural form
The goal is not only correct conjugation. The full sentence should still sound natural for the situation.
Common Korean irregular patterns
These are the patterns learners run into often when writing short diary entries, introductions, homework answers, and "does this sound natural?" sentences.
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ㄷ irregular
듣다 changes to 들어요
Some stems ending in ㄷ change to ㄱ before a vowel-starting ending. A common example is 음악을 들어요.
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ㅂ irregular
쉽다 changes to 쉬워요
Many stems ending in ㅂ change to 우 or 오 before the ending. This is common in descriptive verbs like 어렵다 and 쉽다.
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ㅅ irregular
낫다 changes to 나아요
Some stems ending in ㅅ drop the final consonant before a vowel-starting ending. Not every ㅅ stem does this, so the verb has to be learned with its pattern.
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르 irregular
빠르다 changes to 빨라요
Many stems ending in 르 add an extra ㄱ or ㄹ sound before 아/어요, depending on the vowel before 르.
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ㅎ irregular
그렇다 changes to 그래요
Some descriptive verbs ending in ㅎ lose ㅎ and combine with the following vowel. This appears in useful words like 그렇다 and 이렇다.
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ㄹ irregular
살다 changes to 사니까
Stems ending in ㄹ often drop ㄹ before endings beginning with ㄴ, ㅂ, or ㅅ. The pattern is common, but it depends on the ending.
How to practice irregulars in real writing
Irregular conjugation gets easier when it is tied to sentences you actually want to write. Instead of drilling only tables, write one short sentence and check both the form and the tone.
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Write a sentence with one target verb
Start with something simple, such as what you listened to, what was difficult, or how the weather felt.
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Check whether the ending triggers a change
Ask whether the ending begins with a vowel, or whether it is one of the endings that affects ㄹ stems.
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Review the whole sentence for naturalness
A correct verb form can still sit inside an awkward sentence. This is where Nati can help with the rewrite and explanation.
Frequently asked questions
Are Korean adjectives conjugated like verbs?
Yes. Words that English learners often call Korean adjectives are descriptive verbs, so they attach endings and can follow irregular patterns just like action verbs.
Do all stems with the same final consonant become irregular?
No. Some stems are regular even when they look similar. For example, learners usually need to memorize which ㅂ or ㅅ stems change and which do not.
Should I memorize every irregular form first?
Start with common verbs and adjectives, then practice them in real sentences. Recognition plus repeated sentence use is more useful than memorizing a huge table at once.
Related grammar guide
If verb endings are starting to make sense, review Korean particles and English vs Korean sentence structure and Korean sentence endings and Korean past tense next. These are places where a technically correct sentence can still feel unclear or unnatural without the right context.