Что бы построить предложение в Past Simple надо к глаголу добавить -ed. А если вопрос то Did выноситься на перед и тогда к глаголу ничего не добавляется потому, что Did уже показатель. Отрицание - didn't.
1. Did you go to school yesterday?
2. He read an interesting book last month
3. I looked for my keys but I didn't find them
4. I wasn't hungry so I didn't eat anything
5.Did you speak to Fred yesterday?
6. Did you ring the bell?
7. I didn't hear anything
8. What did you have for breakfast?
9.How many books did you buy?
10 He opened his presents on Xmas
11. I washed my clothes on Saturday