• Was it Monday yesterday?
No, it wasn't.
• Did you have fun yesterday?
Yes, I did.
• Did you go to school yesterday?
No, I didn't.
• Did your mother make fruit salad last week?
Yes, she did.
• Did your father go shopping last Saturday?
No, he didn't.
• Were you busy last sunday?
Yes, I was.
• Were you happy yesterday?
No, I wasn't.