!)Did the students understand the lessons?
The students didn't understand the lessons.
2)Did the man remember the scool rules?
The man didn't remember the scool rules.
3)Did charel create fashionable clothes?
Charel didn't create fashionable clothes.
4) Did frank talk to my boss?
Frank didn't talk to my boss.
5)did she relax after lunch?
She didn't relax after lunch.
6) Did I buy many good books?
I didn't buy many good books.