1. Lucia didn't go to school last Monday because she was ill.
If Lucia had not been ill, she would have gone to school last Monday.
2. I didn't cook dinner yesterday evening because my husband brought pizza.
If my husband. had not brought pizza, I would have cooked dinner yesterday evening.
3. My father wasn't at home last night because he had an important meeting at the office.
If my father had not had an important meeting at the office, he would have been at home last night.
4. Peter went out with his friends because he finished his homework on time.
If Peter had not finished his homework on time, he would not have gone out with his friends.
5. We were late for work yesterday morning so the boss was very angry
if we hadn't been late for work yesterday morning ,the boss wouldn't be very angry