Verb To-Be 이다 in Korean | SayJack - An Asian Language …
The Korean sentences above with different Honorific Speech and Speech Levels in Korean convey the same meanings. Notice that 책 (book) is a noun in the sentences. The choice of 이에요/예요 and 이야/야 is based on Consonant Vowel Sequences in Spoken Korean. If the noun ends with a vowel, use 예요 or 야. If the noun ends with a consonant, use 이에요 or 이야. 버스예요.