Korean Conjugation Rules Rule 1) If the last syllable of the stem is in the CVC(C) form and contains one of the vowelsㅏ,ㅑ, ㅗ, or ㅛ, we add 아요 after the stem.
Rule 2) If the last syllable of the stem is in the CVC(C) form and contains one of the vowels ㅓ, ㅕ, ㅜ, ㅠ, ㅡ, or l, we add 어요 after the stem.
Rule 3) If a word contains the verb 하다, 하다 changes to 해요.
Rule 4) If the last syllable of the stem is in the CV form (except in the case where the last syllable of the stem contains the vowels ㅗ, ㅜ, l, ㅟ, ㅚ, or ㅡ), then the honorific ending marker요is added after the stem.
Rule 5) If the last syllable of the stem is in the CV form, and if it contains the vowel ㅗ, ㅗ changes to ㅘ and the honorific ending marker 요 follows.
Rule 6) If the last syllable of the stem is in the CV form, and if it contains the vowel ㅜ, ㅜ changes to ㅝ and the honorific ending marker요 follows.
Rule 7) If the last syllable of the stem is in the CV form, and if it contains the vowel ㅟ, 어요 is added after the stem
Rule 8) If the last syllable of the stem is in the CV form, and if it contains the vowel ㅚ, ㅚ changes to ㅙ, and the stem gets followed by the honorific ending marker 요.
Rule 9) If the last syllable of the stem is in the CV form, and if it contains the vowel ㅣ,ㅣchanges to ㅕ and the honorific ending marker요 follows.
Rule 10) If the last syllable of the stem is in the CV form, and if it contains the vowel ㅡ , ㅡ changes to ㅓ and the stem gets followed by the honorific ending marker 요.
Rule 11) If the last syllable of the stem is in the CV form, and if it contains the vowel ㅡ, ㅡ changes to either ㅏ or ㅓ depending on the vowel of the antecedent syllable. For example, If the vowel of the antecedent syllable is one of the following vowels ㅏ,ㅑ, ㅗ or ㅛ, then ㅡ changes to ㅏ. Likewise, if the vowel of the antecedent syllable is one of the vowelsㅓ, ㅕ, ㅖ ㅜ, ㅠ, ㅡ, or l, then ㅡchanges to ㅓ. In each of these two examples, the honorific ending marker요 follows at the end.
Rule 12) If the last syllable of the stem is 르, another ㄹ is added under the CV form of the preceding syllable of 르. The ㅡ vowel of the syllable르 also changes to eitherㅏ or ㅓ, depending on the vowel of the preceding syllable. For example, if the preceding syllable of the syllable르 contains one of the vowelsㅏ,ㅑ ㅗ, or ㅛ, the vowel ㅡ belonging to 르 changes to ㅏ. Likewise, if the preceding syllable of 르 has one of the vowelsㅓ, ㅕ, ㅜ, ㅠ, ㅡ, or ㅣ, the vowel ㅡ belonging to the syllable 르 changes to ㅓ. In each case, the honorific ending marker요 follows at the end.
Exception) 따르다 “to follow” is conjugated into 따라요 Rule 13-a) For some stems, whose last syllable contains the consonantㅂ underneath the CV form, ㅂ is dropped and is conjugated with 워요. Since there is no rule for the case when the bottom consonant ㅂ is dropped, you have to learn each word by heart.
*돕다 (to help) is an exception because 돕다 changes to 도와요 Rule 13-b) For other stems where the last syllable contains the consonantㅂ underneath the CV form, ㅂ is not dropped. Instead, if the last syllable contains one of the vowelsㅓ,ㅕ,ㅜ, ㅠ, ㅡ orㅣ, we add 어요 after the stem. Likewise, if the last syllable of the stem contains one of the vowelsㅏ,ㅑ, ㅗ, or ㅛ , we add 아요 after the stem. Since there is no rule for the case when the bottom consonant ㅂ is kept, you have to learn each word by heart.
Rule 14-a) For some stems where the last syllable contains the consonantㄷ underneath the CV form, ㄷ changes to ㄹ and it becomes conjugated with either어요 or 아요, depending on the vowel that is present. Since there is no rule for the case when the bottom consonant ㄷ changes to ㄹ, you have to learn each word by heart. For example, if the last syllable of the stem contains one of the vowelsㅓ,ㅕ, ㅜ, ㅠ, ㅡ orㅣ, we add 어요 after the stem. Likewise, if the last syllable of the stem contains one of the vowelsㅏ,ㅑ,ㅗ, or ㅛ, we add 아요 after the stem.
Rule 14-b) For some stems where the last syllable contains the consonantㄷ located underneath the CV form, ㄷdoes not get dropped. Instead the last syllable is simply conjugated with either어요 or 아요 depending on the vowel that is present. Since there is no rule for the case when the bottom consonant ㄷ is kept, you have to learn each word by heart. For example, If the last syllable of the stem contains one of the vowels ㅓ,ㅕ,ㅜ, ㅠ, ㅡ orㅣ, we add 어요 after the stem. If the last syllable of the stem contains one of the vowelsㅏ,ㅑ, ㅗ, or ㅛ, we add 아요 after the stem.
Rule 15-a) For some stems, whose last syllable contains the consonantㅅ underneath the CV form, ㅅ is dropped and it becomes conjugated with either어요 or 아요, depending on the vowel that is present. Since there is no rule for the case when the bottom consonant ㅅ is dropped, you have to learn each word by heart. For example, if the last syllable of the stem contains one of the vowelsㅓ,ㅕ, ㅜ, ㅠ, ㅡ orㅣ, we add 어요 after the stem. Likewise, if the last syllable of the stem contains one of the vowelsㅏ,ㅑ,ㅗ, or ㅛ, we add 아요 after the stem.
Rule 15-b) For some stems where the last syllable contains the consonantㅅ located underneath the CV form, ㅅ does not get dropped. Instead the last syllable is simply conjugated with either어요 or 아요 depending on the vowel that is present. Since there is no rule for the case when the bottom consonant ㅅ is kept, you have to learn each word by heart. For example, If the l-ast syllable of the stem contains one of the vowels ㅓ,ㅕ,ㅜ, ㅠ, ㅡ orㅣ, we add 어요 after the stem. If the last syllable of the stem contains one of the vowelsㅏ,ㅑ, ㅗ, or ㅛ, we add 아요 after the stem.
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