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Yes, I did.
Did you help your parents do housework yesterday?
Did you wash the dishes last week?
Yes, I did. / Yes, we did.
Did they cook dinner last night?
Yes, they did.
Did she listen to music last Saturday?
Yes, she did.
Did you watch TV yesterday?
No, I didn't.
What did you do yesterday?
I planted trees.
Let's learn.
I painted a picture.
Judy - police officer
Judy
Hello, Judy. How are you?
Hi, Miss Guo. I'm quite good.
But I was busy yesterday.
Why? What did you do yesterday?
We had a new case(案件) !
Yesterday, someone got the food without any money in the supermarket！I had 4 suspects.
I wanted to know “Who was the thief(小偷) ?”
Four suspects(嫌疑人)
One of them steal(偷) the food.
Can you help me find the thief(小偷)? What did they do yesterday?
Was he the chief ?
Tips：动词变过去式基本规则：
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