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.