In Hungarian grammar, the Perfect Progressive theory refers to the verb tenses used to express an action that was ongoing in the past and is still ongoing in the present. This tense is formed by using the auxiliary verb “van” (to be) in its present tense form, followed by the past participle of the main verb, and the present participle of the verb “van.” For example, to say “I have been reading,” we use the construction “vagyok olvasva” (am be read), where “vagyok” is the present tense form of “van,” and “olvasva” is the past participle of “olvas” (to read), and the present participle of “van.”

The Perfect Progressive theory is used to talk about actions that started in the past and are still happening in the present. It emphasizes the continuous nature of the action and can be used to indicate duration or progress in an activity. This tense is particularly useful for expressing ongoing habits or repeated actions. For example, “She has been studying for three hours” can be translated as “Ő három órája tanul” using the Perfect Progressive tense. Overall, understanding and properly using the Perfect Progressive theory is essential for expressing ongoing actions in Hungarian.