PAST PERFECT PROGRESSIVE

POSITIVE_ 
1. We had been sleeping for 12 hours when he woke us up.
2. They had been waiting at the station for 90 minutes when the train finally arrived.
3. We had been looking for her ring for two hours and then we found it in the bathroom.
4. They had been running.
5. She had been learning English before she went to London.
6. She had been crying.
7. He had been driving less than an hour when he ran out of petrol.
8. They had been playing play-station in her house.
9. He had been smoking.
10. They had been cycling all day so their legs were sore in the evening.

NEGATIVE_ 
1. We hadn't been sleeping for 12 hours when he woke us up.
2. They hadn't been waiting at the station for 90 minutes when the train finally arrived.
3. We hadn't been looking for her ring for two hours and then we found it in the bathroom.
4. They hadn't been running.
5. She hadn't been learning English before she went to London.
6. She hadn't been crying.
7. He hadn't been driving less than an hour when he ran out of petrol.
8. They hadn't been playing play-station in her house.
9. He hadn't been smoking.
10. They hadn't been cycling all day so their legs were sore in the evening.

QUESTION_
1. How long had been we sleeping for 12 hours when he woke us up?
2. How long had been they waiting at the station for 90 minutes when the train finally arrived?
3. How long had been we looking for her ring for two hours and then we found it in the bathroom?
4. How long had been they running?
5. How long had been she learning English before she went to London?
6. How long had been she crying?
7. How long had been he driving less than an hour when he ran out of petrol?
8. How long had been they playing play-station in her house?
9. How long had been he smoking?
10. How long had been they cycling all day so their legs were sore in the evening?