I had read a book by 3 p.m.I hadn't read a book by 3 p.m. Had you read a book by 3 p.m.?
I had washed the dishes before mother came.I hadn't washed the dishes before mother came. Had you washed the dishes before mother came?
We read a book which we have found last week. We didn't read a book which we have found last week. did you read a book which you have found last week?