1) Mother was cooking dinner in the kitchen at 5 o`clock.
What was mother cooking in the kitchen at 5 o`clock?
Where was mother cooking dinner at 5 o`clock?
What time was mother cooking dinner in the kitchen?
2) My friend was standing at the bus-stop when I saw him.
Where was my friend standing when I saw him?
Who was standing "at the bus-stop when I saw him?
What was my friend doing when I saw him?