I didn't know that vs I don't know that

Both phrases are correct, but they are used in different contexts. 'I didn't know that' is used to express past tense, indicating that the speaker was unaware of something in the past. 'I don't know that' is used to express present tense, indicating that the speaker is currently unaware of something.

Last updated: March 27, 2024

I didn't know that

This phrase is correct and commonly used in English to express past tense.

This phrase is used to indicate that the speaker was unaware of something in the past.

Examples:

I didn't know that you were coming to the party last night.
She didn't know that the store was closed on Sundays.

Alternatives:

I wasn't aware of that
I had no idea about that

I don't know that

This phrase is correct and commonly used in English to express present tense.

This phrase is used to indicate that the speaker is currently unaware of something.

Examples:

I don't know that you can't bring pets into the building.
He doesn't know that the meeting has been rescheduled.

Alternatives:

I'm not aware of that
I have no idea about that

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I didn't know that vs I don't know that

I didn't know that

I don't know that

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