N+이다

Common conjugation

• 입니다: Formal, polite form, used in formal writings or respectful speech.
• 예요/이에요: Polite form, used in everyday polite conversation. 예요 follows a vowel, and 이에요 follows a consonant.
• 이야: Informal form, used with close friends or in casual settings - See N+(이)야.

Opposite

The opposite of 이다 is 아니다.

Bridge with verbs

There are a lot of grammar pattern that would normally require to be connected to a verb base (action/descriptive verb) but they can be connected to nouns by using N+이다 as a bridge.

Here is an example with V+(으)며:

• 졸업식에 가족이며 친구며 아는 사람들이 다 왔어요.

  All my acquaintances including my family and friends came to the graduation ceremony.

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