We already know that the rule of question tag is that a negative sentence is turned into a positive one and vice versa.
But are there any cases where we can use a positive tag even the sentence is positive,too, or vice versa i.e a negative tag with a negative sentence?
I know that this is possible when the sentences expresses ,for example, an order that must be carried out as the one below.
Father to son: "You will buy the bread today, will you?"
I would appreciate it if you could elaborate on this.