alt : http://www.english-distance.ru/file.php/3/6._The_verb/Finite_Forms/Pat%20Cont_Past%20Simple_%D1%81%D1%80%D0%B0%D0%B2%D0%BD%D0%B5%D0%BD%D0%B8%D0%B5/Past%20Continuous_Past%20Simple_%D1%81%D1%80%D0%B0%D0%B2%D0%BD%D0%B5%D0%BD%D0%B8%D0%B5.htm

Past Simple/Past Continuous