The Perfect Progressive tense in Catalan grammar combines aspects of both the Perfect tense and the Progressive tense. It is used to talk about actions that began in the past, are still ongoing in the present, and may continue into the future.

To form the Perfect Progressive, you use the auxiliary verb “haver” (to have) in the Present tense, followed by the gerund form of the main verb. For example, “he estat parlant” (I have been speaking).

The Perfect Progressive is often used to describe actions that have been happening for a specific duration of time. For example, “He estat llegint aquest llibre durant dues hores” (I have been reading this book for two hours).

It is important to note that the Perfect Progressive is not as commonly used as the Perfect or Progressive tenses in Catalan. However, it can add nuance and emphasis to your sentences when needed. So, if you want to express an action that started in the past, is still going on, and may continue into the future, you can rely on the Perfect Progressive tense in Catalan grammar.