how should I say?
They had their house painted, hadn't they?
or
They had their house painted, didn't they?
had is in the past tense , so it would be correct to use didn't in the tag but the answer in my book is hadn't
if the construction were in the negative they didn't have their house painted, did they? that would be the answer so, why does the book give me the "hadn't" tag for the affirmative?
They had their house painted, hadn't they?
or
They had their house painted, didn't they?
had is in the past tense , so it would be correct to use didn't in the tag but the answer in my book is hadn't
if the construction were in the negative they didn't have their house painted, did they? that would be the answer so, why does the book give me the "hadn't" tag for the affirmative?