The Tense Comparison Theory in Vietnamese Grammar is a significant concept that helps learners understand and differentiate between different tenses in the Vietnamese language. The theory states that there are three basic tenses in Vietnamese: present, past, and future.

The present tense is used to describe actions or events happening at the present time. It is formed by using the base form of the verb. For example, “Tôi đến từ Việt Nam” (I come from Vietnam).

The past tense is used to describe actions or events that have already happened in the past. It is formed by adding the past particle “đã” before the verb. For example, “Tối qua tôi đã đi xem phim” (Yesterday, I watched a movie).

The future tense is used to describe actions or events that will happen in the future. It is formed by adding the future particle “sẽ” before the verb. For example, “Ngày mai tôi sẽ đi du lịch” (Tomorrow, I will go travel).

Understanding and applying the Tense Comparison Theory is crucial for learners of Vietnamese to express themselves accurately and effectively in different time frames.