The Tense Comparison Theory, or “Teoria da Comparação de Tempos” in Portuguese, is a fundamental concept in Portuguese grammar that explains the relationship between different tenses and their usage. This theory states that the choice of a specific tense depends on the temporal relationship between the main verb and the secondary verb or subordinate clause.

In Portuguese, there are three primary tenses: the present, past, and future. Each tense has its own specific use and meaning. The present tense is used to talk about actions happening in the present or to express general truths. The past tense is used to talk about completed actions in the past, while the future tense is used for actions that will happen in the future.

When we have a subordinate clause expressing a condition or time relationship, we use different tenses to establish the temporal relationship between the main clause and the subordinate clause. For example, when the main clause is in the present tense, we use the present or future tense in the subordinate clause. Likewise, when the main clause is in the past tense, we use the past tense in the subordinate clause.

Understanding the Tense Comparison Theory is crucial for mastering Portuguese grammar and using the correct tenses in different contexts. It allows learners to accurately convey the temporal relationship between actions or ideas and effectively communicate in Portuguese.