How do I change this complex sentence into a simple sentence?

He knows that time once gone is gone forever.

  • 5
    What makes you think you can change a sentence to a simple sentence? Dec 25 '20 at 21:09
  • It was assigned to me to change this to a simple sentence. However I find my abilities limited.
    – Mogno Khan
    Dec 25 '20 at 21:11
  • 2
    You would have to show us similar exercises and their expected answers. Otherwise we cannot know the model that the instructor is expecting you to follow. Are you sure you should produce only one simple sentence instead of one per clause from the original? Imagine how you would combine these two simple sentences into one complex one: Spent time is forever behind us. He knows this.
    – tchrist
    Dec 25 '20 at 21:54
  • He knows about the unstoppable nature of time.
    – Ram Pillai
    Dec 26 '20 at 3:48
  • Buck-passed to ELL? 'Return to setter' is my advice. Dec 26 '20 at 13:03