1. Were it necessary to increase the speed of this particular engine, it could be achieved by using a special device.
2. Had the road been better, we would have been here in due time.
3. Had the engineer been informed of the results before, he would have allowed you to repeat the test.
4. Had we used new methods, we would have saved a lot of time.
5. Had the oil supply stopped even for a moment, serious damage might have resulted.
6. Were the mechanic there, he would repair the equipment.
7. Were the air within the cylinder motionless, only a small proportion of the fuel would find enough oxygen.
8. Were the books on that subject available in our library, I would be able to make a good report.