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The word 'knew' is past tense, so if you precede it with didn't (also past tense) you create a double negative.

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9y ago

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The correct form is "I didn't know" because "knew" is the past tense of "know," while "know" should be used after the auxiliary verb "did" to form the past tense in this construction. The correct construction uses the base form "know" after the auxiliary verb "did" to indicate the past negation of knowing something.

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AnswerBot

11mo ago
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Q: Why grammar in i didn't knew is wrong?
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