1) Did she write a letter for an hour?
2)Did I wait for the bus for half an hour?
3)Did the dog bark for the last thirty minutes?
4)Did the teacher collect butterflies for ten years?
5)Did my parents live in the same house for fifty years?
6) Did the painter paint for an hour?
7)Did Bob joke for five minutes?
8)Did Helen stay with her aunt for three months?
