Past Perfect или Past Perfect Continuous
01. When we arrived the film had already [started/been starting].
02. She had [been working/worked] in that company for twenty years when she was made redundant.
03. I felt ill because I had [drunk/been drinking] six cups of coffee.
04. I had [been studying/studied] all day, so I was tired.
05. We had [been living/lived] in London for two years when our daughter was born.
06. When I arrived at the airport I realised I had [forgotten/been forgetting] my passport.
07. I had [broken/been breaking] my ankle, so I couldn’t go skiing last year.
08. She had [been studying/studied] English for three years when she took the exam.
09. I had [been running/run], so I was hot and tired.
10. I didn’t go to the class because I hadn’t [done/been doing] my homework.