4 концовки/начала придумать к карточкам нужно past simple и present perfect (объединить их в каждом из предложений)
Нужно соединить, или придумать своё? Ведь 1 с 3 и 2 с 4 хорошо соединяются.
They were wet because they were swimming in the river.
He was unhappy because he was late for the bus.
He didn't come to school because he had broken his leg.
We're stayed at home because it was raining outside.