Tense Comparison Theory in Korean grammar refers to the usage of different tenses to express various time relationships between actions or events. In Korean, there are three primary tenses: present tense, past tense, and future tense.

The present tense is used to express actions or states that are happening at the present moment. It is formed by adding the suffix “-다” to the verb stem.

The past tense is used to express actions or states that have already occurred in the past. It is formed by adding the suffix “-았/었-” to the verb stem.

The future tense is used to express actions or states that will happen in the future. It is formed by adding the suffix “-(으)ㄹ” to the verb stem.

In addition to these basic tenses, there are also other tenses in Korean grammar, such as the present progressive tense, past progressive tense, present perfect tense, and past perfect tense. These tenses are formed by combining auxiliary verbs with the basic tenses.

Overall, understanding and applying tense comparison theory in Korean grammar is essential for expressing accurate time relationships in sentences.