1 what have you been doing
2 has Mathew visited
3 has been learning
4 have been playing
5 has Sam studied ( действие завершено, спрашиваем о результате)
has Sam been studying ( показываем длительность действия в процессе)
6 has never played
7 have you been waiting
8 haven’t seen
9 has been writing- hasn’t finished
Объяснение:
