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

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

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?

Alternatives:

  • how do you know that?

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?

Alternatives:

  • how do you know?

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