Tenses Indicative Theory is a key aspect of Korean grammar that plays a vital role in expressing time and temporal relationships in sentences. Korean tenses are categorized into four main types: present tense, past tense, future tense, and future tense in relation to the present.

The present tense in Korean is used to describe actions or events that are happening at the time of speaking or actions that are habitual. It is formed by adding the suffix -ㄴ/는다 to the stem of the verb.

The past tense, on the other hand, is used to express actions or events that have already occurred. It is formed by adding the suffix -았/었다 or -ㅆ/었다 to the verb stem.

The future tense in Korean indicates actions or events that will happen in the future. It is formed by adding the suffix -ㄹ/을 거 (da) or -겠다 to the verb stem.

Lastly, the future tense in relation to the present refers to actions or events that will happen after a certain point in the future. It is formed by adding the suffix -ㄹ/을 거예요 to the verb stem.

Understanding these different tenses is essential for effective communication and proper grammatical usage in the Korean language.