Ответ:

№Глагольное сочетаниеPast SimplePast Continuous
1he / walkhe walkedhe was walking
2I / cleanI cleanedI was cleaning
3it / rainit rainedit was raining
4we / planwe plannedwe were planning
5they / dancethey dancedthey were dancing

Правило: Past Simple образуется с окончанием -ed у правильных глаголов, а Past Continuous — с формой was/were + глагол с окончанием -ing.