Раскройте скобки, постройте предложения в Past Perfect Continuous
1) My sister … (to practise) for two months before that concert.
2) The boys … (to fish) for three hours before Tom caught the first fish.

3) We … (to discuss) that problem for more than an hour before we found the right solution.
4) Tom … (to wait) for half an hour before he saw his girlfriend getting off the tram.
5) Driving to the hospital was difficult as it … (to snow) all night.
6) David … (to study) economy since she entered university. — Правильный ответ на вопрос найдете ниже