Vicky works in
an Italian restaurant: Does Vicky work in an Italian restaurant? Who works in
an Italian restaurant? Where does Vicky work?
I worked only for 3 days this week: Did I work only three days this week? Who
worked only three days this week? How many days a week did I work?
The radio is working now: Is the radio working now? What is working now? When
is radio working?
We have been working in the garden since morning: Have we been working in the
garden since morning? Who has been working in the garden since morning? Where have
we been working since morning? When (How long) have we been working in the garden?