1. Переведите следующие предложения на русский язык, обращая внимание на союзы условных придаточных предложений if, unless, provided.

1. If they needed the equipment urgently, we could transport it by plane.

2. The accident would not have happened, if they had been more careful.

3. If I were in his place, I would refuse to stop the experiment.

4. If the goods are shipped in April, they will arrive before the expedition starts.

5. The sputnik will keep to its orbit provided it travels at the uniform speed of 8 kilometres per second.

6. It would have been impossible to send up sputniks unless the laws governing the motion of planets had been studied.

7. If I were you I would first test the car.

8. You’ll fail in English unless you work harder.

2. Переведите бессоюзные условные придаточные предложения.

1. Had he used new materials, the device would have been more reliable.

2. Were electric motors used, cars would not pollute the air, would be practically noiseless and very easy to control.

3. Had they applied the new method, the result would have been much better.

4. Were the design of cars improved, the fuel consumption would be greatly reduced.

5. Had a less explosive gas been used in dirigibles at the beginning of the century, they would have been in operation since that time.

6. Were it possible to learn how birds find their way, people would use the principle to develop a naviga­tion system for aviation.

7. Had it been avoided in the other problems, W would have been smaller by x.

8. Were the air composed only of nitrogen, burning would be impossible.