Ответ:

1)you didn't understand questions

2)I didn't ask you to write an essay

Ответ:

2. You didn't understand the questions.

3. I didn't asked you to write an essay.

4. Michelangelo didn't paint the Mona Lisa.

5. We didn't watch a DVD about ancient technology.

6. The ancient Greeks didn't discover nuclear energy.

7. Marie Curie didn't invent the TV.

8. You didn't check your grammar and spelling.