Simple Past Negative

I don't like cucumber. -> I didn't like cucumber.
They don't steal a drink in the supermarket. -> They didn't steal a drink in the supermarket.
He doesn't get up early in weekend. -> He didn't get up early in weekend.
did 다음에 동사 원형(base form)이 온다는 사실은 변함 없다.

Simple Past Questions

(W/H + ) did + subject + base form
W/H는 의문사를 뜻하고, 기본적인 형태니 순서를 잘 기억하자.
What do you do? -> What did you do?
Do you have a boyfriend? -> Did you have a boyfriend?
Does his uncle hate hiphop? -> Did his uncle hate hiphop?

Answer

긍정문의 경우에는 이전과 똑같이 did로 물어봤으니까 did로 대답하면 된다.
Q: Did they cut their hair?
A: Yes, they did.

Q: Did you see him last night at the rock festival?
A: No, I didn’t.