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 • 1084 views

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?"

Show examples from the web [+]

What do you know about long term relationships?
How long you know about this?
- What do you know about it?
How do you know about it? - Well, I sing there for open-mike night.
What do you know about it?
What do you know about it?
What do you know about it?
So how do you know about it?
What do you know about it?
- What do you know about it?
What do you know about it?
- What do you know about it?
What do you know about it? Agent Eppes, I am as mystified as you are.
What do you know about it?
What do you know about it?
What do you know about it?
What do you know about it?
What do you know about it?
What do you know about it?
What do you know about it?

Alternatives:

How long have you known about it?

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