Поставить в предложение глагол-сказуемое в present, past, future perfect tense в действительный залог: on the average students attend school approximately six hours a day.
Present, Past, Future Perfect On the average students have attended school approximately six hours a day. On the average students had attended school approximately six hours a day. On the average students will have attended school approximately six hours a day.
On the average students have attended school approximately six hours a day.
On the average students had attended school approximately six hours a day.
On the average students will have attended school approximately six hours a day.