For those who want to learn korean!!!
(info colected from several apps/books to make it as full and organized as possible)(all the credit to that apps/books)
If the final syllable in a stem is 르 (마르다), it is conjugated differently when adding 아/어. This irregular only applies when adding 아/어(or any of its derivatives) to a stem and not when adding any other grammatical principles that starts with a vowel or consonant. Up until now, you haven't learned about any of these other grammatical principles, that can start with anything other than 아/어, so don't worry about this distinction too much.
When adding 아/어 to these words, an additional ㄹ is created and placed in the syllable preceding 르 as the last consonant. The 르 also gets changed to either 러 or 라 (depending on if you are adding 어 or 아). This is done to both verbs and adjectives (the only exception is 따르다 = to follow/to pour). For example:
다르다 = different ↘다르 + 아요 = 다 + ㄹ + 라요 = 달라요 ↘그것은 달라요 = That thing is different
빠르다 = to be fast ↘빠르 + 아요 = 빠 + ㄹ + 라요 = 빨라요 ↘그 남자는 빨라요 = That man is fast
부르다 = to call somebody’s name ↘부르 + 었어요 = 부 + ㄹ + 렀어요 = 불렀어요 ↘저는 저의 누나를 불렀어요 = I called my sister
Here is a table with the word “고르다 (to choose – which is a verb)” being conjugated using all the honorific forms you have learned so far. The irregular conjugations are in bold. Notice that this only occurs when 아/어 (or one of its derivatives like 았/었어요) is added to the verb stem.
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And here is a table with the word “빠르다 (fast/quick – which is an adjective)” being conjugated using all the honorific forms you have learned so far. The irregular conjugations are in bold. Notice that this only occurs when 아/어 (or one of its derivatives like 았/었어요) is added to the verb stem.
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ㄹ Irregular
As you know, there are times when you must choose between two things to add to a stem. For example:
🔹아/어 means you must choose between adding 아 or 어 🔹ㄴ/은 means you must choose between adding ㄴ or 은 🔹ㅂ/습 means you must choose between adding ㅂ or 습 🔹ㄹ/을 means you must choose between adding ㄹ or 을
