How do you know? vs How do you know that?

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Looking on the internet deeply has found these results:

How do you know? is the most popular phrase on the web. 

How do you know that?

193,300,000 results on the web

How do you know?

1112,000,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • How do you know that?
  • How do you know that?
  • Wait, how do you know that?
  • Hitler then asks, "How do you know that?"
  • Okay. How do you know that?
  • I read about it, in a book.
  • Then I'd say, "How do you know?"
  • But never to exist again?
  • (Derek) How do you know?
  • Yes. How do you know?
  • I said, "How do you know?"
  • "He's not in Napa, he's at the ice factory," he'll say, "How do you know?"
  • How do you know?
  • and he said, "How do you know?" I said, "I heard it!"

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