The children (play) on the computer for a long time. Tell them to stop.
Jill (swim) in this lake since she was a child.
The students (try) to reduce pollution for years.
How long (you/take care) of this injured cat?
You look tired. (you/work) in the garden all afternoon?
Acid rain (destroy) natural habitats for years
Nick (work) here for over ten years.