Grammatically, which sentence is correct, “I didn’t know” or “I didn’t knew”?

“I didn’t know” is correct sentence.
or “I didn’t knew” is grammatically incorrect because did or didn’t is always follwed by present form of verb.

Grammar rule: did + V1

‘did’ can never be followed by a past tense or past participle of a verb; it is always followed by a present tense. Here are some examples:

  • I didn’t know (not ‘knew’)
  • I didn’t do it (not ‘did’)
  • I didn’t write it (not ‘wrote’)

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