Tense theory is an essential aspect of Lithuanian grammar. The Lithuanian language has three main tenses: present, past, and future.

The present tense is used to describe actions happening in the present moment. It is usually formed by adding certain endings to the verb stem.

The past tense is used to describe actions that have already happened. The structure of the past tense varies depending on the verb class. Some verbs form the past tense by adding certain endings, while others undergo internal vowel changes.

The future tense is used to describe actions that will happen in the future. It is formed by adding specific endings to the verb stem.

In addition to these three main tenses, Lithuanian grammar also includes additional tenses, such as the imperfect tense, the perfect tense, and the pluperfect tense. These tenses are used to provide more precise temporal information or indicate actions that occurred before other past actions.

Understanding tense theory is crucial in mastering Lithuanian grammar, as it allows learners to express themselves accurately and effectively in various time frames. Practice and exposure to various tenses are essential for learners to become proficient in using the correct tense in different contexts.