一般现在时：He sells books.Does he sell books?He doesn't sell books.
过去式：He sold books.Did he sell books?He didn't sell books.
现在进行时：He is selling books now.Is he selling books now He isn't selling books now?
我个人认为这句话除了用最上面二种时态最合适.其它时态：过去完成时,将来时,完成进行时等都不好,你自己看着办吧.至于被动,按照常规英语翻译,并不会把这句话翻译为被动形式.Eg:The books are sold by him.