The Past Perfect Progressive, also known as the Past Perfect Continuous, is a verb tense used to express an ongoing action or situation that was happening up until a particular moment in the past. In Slovenian grammar, this is often expressed using the auxiliary verb “biti” in its past participle form, along with the participle form of the main verb – usually ending in -l. This combination of elements produces a tense that emphasizes the duration or continuousness of an action in the past.