1. No, i didn't.
2. - He didn't go to school at 8 o'clock today.
? Did you go to school at 8 o'clock today?
You: Yes, i did.
3. - He didn't does his homework in the evening.
? Did you do your homework in the evening?
You: Yes, I did.
4. - He didn't see his uncle last week.
? Did you see your uncle last week?
You: No? I didn't.