-이다

Etymology 1
From, from. For the dialectal politeness particle use, compare, 🇨🇬, both of which come from the copula.

Particle

 * 1) to be;.

Usage notes

 * The declarative ending changes to  in some environments; see  for details.
 * In the informal polite form,, after vowels is often pronounced as  instead of  in many environments.
 * is the Korean positive copula. Along with its negative,, it is sometimes categorized as an adjective, but more often placed in their own grammatical category distinct from both verbs and adjectives. Some grammars classify as a particle and, like a particle, it is appended to the preceding word without an intervening space.
 * For the existential meaning of "be", see.

Conjugation

 * The chart below is for consonant-final nouns.
 * After a vowel-final noun, the initial vowel is deleted when followed by a syllable beginning with a single consonant ( included), except in quite formal language:
 * It is not normally deleted when followed by a consonant cluster, except in quite colloquial language:
 * It is not deleted when used as a noun or adnominal.
 * It is not normally deleted when followed by a consonant cluster, except in quite colloquial language:
 * It is not deleted when used as a noun or adnominal.
 * It is not deleted when used as a noun or adnominal.
 * It is not deleted when used as a noun or adnominal.

Etymology 2
From.