1. If Lucia had been => were here now, she would find out the truth about her uncle’s accident.

2. If a student takes a course on Computer Science, it will take him four years doing => to do the course.

3. Unless => If it did not rain, Peter would pay us a visit.

4. If had I => I had known you were in financial difficulty, I would have helped you.

5. If I had knew => had known the time when the match started, I would have told you.

6. If she had finished => finishes the work, she can go home.

7. If I had spoken more confident => confidently at the interview, they would have offered me the job.

8. If we had had a map, we would not be => have been lost yesterday.

9. Had I known Alice’s address, I would write => would have write to her.

10. If I had realized that the traffic lights were red, I would stop => would have stopped.