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

Both phrases are correct and commonly used in English. The addition of 'that' in the first phrase is optional and does not change the meaning significantly.

Last updated: March 25, 2024 • 802 views

How do you know that?

This phrase is correct and commonly used in English.

This phrase is used to ask someone about the source of their knowledge or information. The addition of 'that' at the end is optional and does not alter the meaning significantly.

Examples:

How do you know that he's coming?
How do you know that it will rain tomorrow?

Show examples from the web [+]

Okay. How do you know that?
Hitler then asks, "How do you know that?"
-How do you know that? -I read about it, in a book.
Wait, how do you know that?
-How do you know that? -Go there all the time.
- How do you know that?
And you said, "How do you know that?"
Man, how do you know that?
Wait, how do you know that?
Jacob, how do you know that?
Really, how do you know that?
Cam, how do you know that?
Wilson, how do you know that?
Henry, how do you know that?
If there is no body, how do you know that?
Mark: Wait, how do you know that?
Now, see, how do you know that?
You say that, but how do you know that?
How did - how do you know that?
How do you know that?.

Alternatives:

how do you know?

How do you know?

This phrase is correct and commonly used in English.

This phrase is also used to ask someone about the source of their knowledge or information. It is a slightly shorter version of the first phrase.

Examples:

How do you know he's coming?
How do you know it will rain tomorrow?

Show examples from the web [+]

I said, "How do you know?"
(Derek) How do you know?
Yes. How do you know?
Then I'd say, "How do you know?"
But never to exist again? -How do you know?
"He's not in Napa, he's at the ice factory," he'll say, "How do you know?"
and he said, "How do you know?" I said, "I heard it!"
Abraham, how do you know?
Vincent, how do you know?
Look, how do you know?
Lost works, but how do you know?
Dean, how do you know?
But it was anonymous, how do you know?
Helen, how do you know?
I mean, how do you know?
Come on, how do you know?
But my question is, how do you know?
Seriously, how do you know?
The question is, how do you know?
- If you're not thinking it, how do you know?

Alternatives:

how do you know that?

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