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I didn't know that vs I didn't knew that

The correct phrase is 'I didn't know that.' 'Knew' is the past tense of 'know,' but in this case, 'didn't' already indicates the past tense, so 'know' should be used in its base form.

Last updated: March 29, 2024 • 12339 views

I didn't know that

This phrase is correct and commonly used in English.

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

I didn't knew that

This phrase is incorrect in English.

The correct form is 'I didn't know that.'

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