If they went to school,they wouldn’t be illiterate.
If you did more exercise, you would get fit.
If I had more money,I would go on holiday.
If you went to bed earlier,you wouldn’t be tired.
If I were ill,I would go to hospital.
В условных предложениях второго типа в придаточном предложении используется Past Simple,а в главном —Future in the past ( would + глагол без частицы to).