The Korean Writing SystemSyllablesNounsPredicatesFormal and Informal SpeechPre-Final and Final EndingsSpeech LevelAdding ㅓ or ㅏ to a predicate stemWords with 받침Adding 으 to predicates stemsThe Deferential Speech LevelThe Intimate Speech LevelThe Polite Speech LevelThe Plain Speech LevelThe Honorific Ending 시Irregular PredicatesParticlesThe Subject Particle 가 and 이The object particle 를 and 을The Topic Particle 는 and 은Forming a Sentence이다 and 아니다있다 and 없다NegationPast TensePredicates as ModifiersDeterminersBound NounsExpressing desire with 고 싶다NumbersCountersQuestionsThe Particle 에The Plural Particle 들The Possessive Particle 의The Particle 에서The Particle 도The Particle 부터The Particle 까지The Particle 만

The Polite Speech Level

In order to to conjugate a predicate into the polite speech level, first add ㅓ or ㅏ  to the predicate's stem followed by . The predicate and are formed irregularly in the polite speech level.
Predicate 
1. The predicate 끄다 is 으 irregular and becomes ㄲ.
2. The stem does not contain a vowel, and so 어요 is added to the stem.
Conjugated predicate 꺼요
Predicate 
1. The predicate 먹다 is regular and does not change.
2. The vowel pronounced closest to the end of the word is ㅓ and so 어요 is added to the stem.
Conjugated predicate 먹어요
Predicate 
1. The predicate 아름답다 is ㅂ irregular and becomes 아름다우.
2. The vowel pronounced closest to the end of the word is ㅜ and so 어요 is added to the stem.
Conjugated predicate 아름다워요
Predicate 
1. The predicate 나쁘다 is 으 irregular and becomes 나ㅃ.
2. The vowel pronounced closest to the end of the word is ㅏ and so 아요 is added to the stem.
Conjugated predicate 나빠요
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