*This grammar is talking about the simple past tense.
1. talking about action that happened and finished.
2. Affirmative : Sub + v2 + C
She wrote a novel yesterday.
3. Negative form: Sub + didn't + v (base) +C.
We didn't do our homework last week.
4. Question form : Did+ sub + v(base) + C?
Did you travel to France last year?
Yes, I did / No, I didn't.