What English books were bought by you yesterday? (Grammar questions) (1)What English books did you buy yesterday? (2)What English books have you bought yesterday? (3)What English books were bought by you yesterday? (4)Which English books did you buy yesterday ? (5)Which English books have you bought yesterday? (6)Which English books were bought by you yesterday ? Which one of my listed sentences is right ? are they the same or different ? Could anyone tell me the reason why it's right or wrong of my listed sentences? thanks :)