1) Melanie has been washing up for 30 minutes.
2) Sadie and Adam have been tidying up for an hour and a half.
3) Lisa has been looking for a bucket for 2 hours.
4) Alison anf Jason have been working in the garden for 2 hours.
5) Don has been cleaning the stairs for 30 minutes.
6) Emma has been repairing a toaster for hour.
7) Trevor has been mending the door bell for 20 minutes.
8) Daniel and Rebecca have been brushing carpets for 2 hours.