1. Was the policeman here yesterday?
Who was here yesterday?
The policeman was here or there yesterday?
The policeman was here yesterday, wasn't he?
2. Are Sasha and Olga are making a cake?
What are Sasha and Olga doing?
Are Sasha and Olga making a cake or chilling out?
Sasha and Olga are making a cake, aren't they?
3. Does she come every day?
Who comes every day?
The girl or the boy comes every day?
The girl comes every day, doesn't she?
4. Did he write to his father yesterday.
When he wrote to his father?
He rote to his father or mother yesterday?
He wrote to his father yesterday, didn't he?