This site clearly shows the basic form of the Past perfect Continuous tense and goes through the different uses, as well as showing how to use it to form positive and negative questions. Resource URL: http://www.englishtenses.com/tenses/past_perfect_continuousScreen shot: Category: Past Perfect ContinuousLevel: Upper IntermediateOverall Design: GoodGraphic Presentation: GoodVideo Presentation: GoodAudio Presentation: N/AInstructions: GoodLearning Objectives: GoodAssessment Method: Below StandardLearning Styles: StandardInteractivity: GoodLearn/Remember/Recall: GoodFinal rating: 73