Tenses play a crucial role in Nepali grammar as they indicate the time at which an action takes place. There are three main tenses in Nepali: past, present, and future.

In the past tense, we use different conjugations of verbs to show actions that have already been completed. When talking about ongoing or habitual actions in the present tense, we modify the verb forms accordingly. The future tense is used to express actions that are yet to happen, and it is formed by adding specific verb endings.

Nepali grammar also incorporates the aspect of tense, which shows the completeness or ongoing nature of an action. There are three aspects: simple, continuous, and perfect. The simple aspect indicates a one-time action, the continuous aspect shows an ongoing action, and the perfect aspect demonstrates a completed action.

Moreover, in Nepali, tenses are often combined with other grammatical elements to convey more precise meanings. For example, the use of auxiliary verbs, particles, or tense markers can help indicate the intention, ability, or obligation associated with an action.

Understanding the tenses theory in Nepali grammar is vital for constructing accurate and meaningful sentences. By mastering tenses, learners can express themselves properly and convey the intended time frame of their actions or events.