1. Lucia didn't go to school last Monday because she was ill.
->If Lucia hadn't 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 hadn't 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 hadn't 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 hadn't finished his homework on time , he wouldn't have gone out with his friends.
5. We were late for work yesterday morning so the boss was very angry with us.
->If we hadn't been late for work yesterday morning , the boss wouldn't have been angry with us.
6. David and Claire didn't buy the house on Park Street because it didn't have a balcony. If the house on Park Street had had a balcony , David and Claire would have bought it.
7. I couldn't get into the house because I forgot the key in the classroom.
-> If I hadn't forgotten the key in the classroom , I could have got into the house.
8. Mr.Jerkins drove his car carelessly.He crashed into a tree.
-> If Mr.Jerkins hadn't driven his car carelessly , he wouldn't have crashed into a tree.
9. Miss Eliot left her umbrella at home so she got soaked in the heavy rain last Sunday.
-> If Miss Eliot hadn't left her umbrella at home , she wouldn't have got soaked in the heavy rain last Sunday.
10. Little boy refused to use the suncream.He had terrible sunburn on his shoulders.
-> If the little boy hadn't refused to use the suncream , he wouldn't have had terrible sunburn on his shoulders.
11. I didn't have my trainers with me so I couldn't play basketball with my friends.
->If I had had my trainers with me , I could have played basketball with my friends.
12. Helen couldn't telephone her friend James because she didn't know the telephone number.
-> If Helen had known the telephone number , she could have helped her friend James.