shouldnt be accepted too: "bereš se sedmého nebo osmého " ?
No. "Brát se" means to marry each other, so it doesn't make sence in dingular. In singular you can use "ženit se" for men and "vdávat se" for women.
I wonder the same thing.
Why is "se" used instead of "si," as we've seen before with this verb?
"brát si + object (accusative)" - to get married to + someone (you need to say to whom)
"brát se" - to marry each other, cannot have another object, the object here is "se"="each other / mutually"
"Budeš se ženit sedmého nebo osmého?" should have been accepted as well of course.
Should be, did you report?
No, that is the future tense and we do not accept it here.
A "Vdáváš se sedmého nebo osmého?"
je to mozne