Tense Comparison Theory in Catalan Grammar is a fundamental concept that allows us to understand how different tenses express different actions and time references. Catalan has a rich verb system, with a variety of tenses that can be used to indicate past, present, and future actions.

One aspect of Tense Comparison Theory is the distinction between simple tenses and compound tenses. Simple tenses, such as the present, imperfect, and future, express actions that are not completed or have no explicit connection to the present moment. On the other hand, compound tenses, such as the perfect, pluperfect, and future perfect, indicate actions that have been completed or have a clear connection to the present.

Another aspect of Tense Comparison Theory is the use of verb tense in subordinate clauses. Catalan has specific rules for using tenses in subordinate clauses depending on the relationship between the main clause and the subordinate clause. This includes the use of the present perfect to express completed actions that have an impact on the present moment, or the use of the imperfect subjunctive to express hypothetical or uncertain actions.

Understanding Tense Comparison Theory is essential for learners of Catalan as it helps them to accurately express actions and time references in the correct tense.