1. If I had eaten lunch, I wouldn't have felt hungry now
2. If Rita had got (some) sleep last night, she wouldn't be exhausted today
3. If Sally had not been absent from school on Friday, she would know what she has to do for homework
4. If Bob hadn’t left his wallet at home this morning, he would have some money for lunch.
5. Were I a rich man ,I could afford to buy an expensive car.
6. Unless you leave me alone, I'll call the police
7. Unless you study hard, you'll fail the exam
8. Had you help me, I would have know how to solve it