A. USE

1. We use the Past Perfect Continuous to show that something started in the past and continued up until another time in the past. "For five minutes" and "for two weeks" are both durations which can be used with the Past Perfect Continuous. Notice that this is related to the Present Perfect Continuous; however, the duration does not continue until now.
Past Perfect Continuous geçmişte başlayıp, yine geçmişte belirli bir zamana kadar devam etmiş olan olayları ifade etmek için kullanılır. Olay geçmişte başlamıştır ve geçmişte başka bir olay gerçekleşmeden önce bitmiştir.

She had been suffering from cancer for ten years before she died.
James had been teaching English at the University for more than a year before he left for Asia.

Note: If you do not include a duration such as "for five minutes," "for two weeks" or "since Friday", many English speakers choose to use the Past Continuous. There is also a difference in meaning.

B. STRUCTURE

Positive Structure:

Negative Structure:

Question structure: