— Did your parents help you with your homework?
—Yes, they did
— No, they didn't
— Did she invite all her friends to the party?
— Yes, she did.
— No, she didn't
— Did the train arrive on time?
— Yes, it did
— No, it didn't
— Did your parents help you with your homework?
—Yes, they did
— No, they didn't
— Did she invite all her friends to the party?
— Yes, she did.
— No, she didn't
— Did the train arrive on time?
— Yes, it did
— No, it didn't