Did you visit your parents yesterday?
Did you visit your parents or your granny yesterday?
Yesterday I visited my parents, didn't I?
Who visited your parents yesterday?
When did you visit your parents?
Did Nina work 7 hours a day?
Did Nina work 7 or 8 hours a day?
Nin worked 7 hours a day, didn't she?
Who worked 7 hours a day?
Why did Nina work 7 hours a day?