Q:

The policeman said, “It is clear that this is the work of a professional robber”.

• 1
  The policeman said that it was clear that that was the work of a professional robber.
• 2
  The policeman said it was clear that is the work of a professional robber.
• 3
  The policeman said that it must be clear that this was the work of a professional robber.
• 4
  The policeman said that it had been clearly the work of a professional robber.