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"how long did you know?" vs "how long do you know about it?"

The correct phrase is "How long did you know?" This is the standard way to ask about the duration of someone's knowledge. The second phrase, "How long do you know about it?" is not correct in English.

Last Updated: March 25, 2024

how long did you know?

This phrase is correct and commonly used in English to inquire about the duration of someone's knowledge.

This phrase is used to ask about the length of time someone has been aware of something or someone.

how long do you know about it?

This phrase is not correct in English. The correct form would be "How long have you known about it?"

The correct way to ask about the duration of someone's knowledge is by using the present perfect tense, as in "How long have you known about it?"

Alternatives:

  • How long have you known about it?

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