Откройте скобки и используйте Past Perfect Continuous My sister … (to practise) for two months before that concert.
The boys … (to fish) for three hours before Tom caught the first fish.
We … (to discuss) that problem for more than an hour before we found the right solution.
Henry … (to wait) for half an hour before he saw his girlfriend getting off the tram.
Driving to the hospital was difficult as it … (to snow) all night.
Polly … (to study) economy since she entered university.
Ron’s collection of coins was valuable as he … (to collect) them since he was a schoolboy.
When Sam returned home we … (to watch) that TV programme for a quarter of an hour already.
Bill’s coat and mittens were wet because he … (to play) snowballs with his friends in the yard.
David was irritated because the police inspector … (to ask) him questions for more than an hour.
