Q:

By whom was this window broken? Five packets of milk were delivered by the milkman.

• 1
  Who broke this window? The milkman delivered five packets of milk.
• 2
  Who had broke this window? The milkman had delivered five packets of milk.
• 3
  Whom was break this window? The milkman will deliver five packets of milk.
• 4
  Who is breaking this window? The milkman is delivering five packets of milk.