I didn't watch / didn't work

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Grammar notes

Did Not Changes the Verb (Past Simple: Negatives)

Use did not or didn't to make the past simple negative.

After didn't, the main verb goes back to its base form.

That is the key trick: the past meaning is already inside didn't.

  • Example: I didn't watch TV.
  • Example: She didn't go to school.

Quick Rule

  • didn't + base verb
  • do not use the past form after didn't

If didn't is in the sentence, let the main verb stay simple.