Progressive theory, also known as the progressive aspect, is an important concept in Catalan grammar. In Catalan, the progressive aspect is formed by combining the verb “estar” (to be) in the present tense with the gerund form of the main verb. This construction is used to indicate an ongoing action or state in the present.

For example, in the sentence “Estic llegint un llibre” (I am reading a book), the verb “estar” is conjugated in the present tense (estic) and is combined with the gerund form of the verb “llegir” (to read) to indicate that the action is happening in the present and is ongoing.

The progressive theory is a useful tool for expressing actions that are happening in the present and emphasizing their ongoing nature. It allows speakers of Catalan to convey a sense of immediacy and continuity in their speech. Mastering the use of the progressive aspect is essential for learners of Catalan as it adds an extra layer of complexity and nuance to their language skills.