8. А) Change the following sentences according to the models.

1. If I were free, I should help you. – Were I free, I should help you.

2. If he had known about the lecture, he would have come. – Had he known about the lecture, he would have come.

1. If it were possible, we should begin this work at once. 2. If he had had all the necessary books, he would have made his report in time. 3. If the books had been available in our library, we could have done this work much earlier. 4. If there were no computers, space flights would be impossible. 5. If drivers were more attentive while driving, there would be less accidents on the road.

b) Translate the sentences into Russian. Pay attention to the word order.

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 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.

9. Translate the sentences into Russian and remember the meaning of the verb “to provide” in all its functions and conjunction “provided”.

1. The experiments conducted provided very good results. 2. Russian technological achievements that provided the launching of rockets are known all over the world 3. A tire pressure display provides information for front and back pairs of tires. 4. Provided new composite materials are used, it will be possible to reduce overall aircraft weight. 5. Provided with a new vacuum-controlled carburetor this car model has several important advantages. 6. Superliners could develop a higher speed provided some special cooling measures were used. 7. An aircraft pilot can get all the information he needs provided he contacts a radio navigation station. 8. The work done provided us with new data. 9. Having measured the distance between two points, it is possible to calculate the time during which a car can cover it, provided we know the car’s average speed. 10. Our laboratory has been provided with the latest equipment.

10. Translate the sentences with the conjunctions provided, if, whether.

1. Specialists reported that a miniature video camera provided the latest submersible with vision. 2. The speed of a satellite would be less provided it moved at a greater distance from the earth. 3. Drivers don’t know yet whether radars will be mounted on the next car model. 4. If the weather is too bad for flying, passenger airplanes don’t leave airports. 5. It was very important to find out if electricity could be used for long distance communication. 6. During the entire flight, the pilot is provided with all the necessary information about weather conditions. 7. Modern submersibles can remain at the depth of 20,000 feet for eight hours or, if needed, as long as two or three days. 8. A new system for motor cars can be provided with infrared sensors that can detect a human figure at night. 9. If underwater tourism continued to develop at the present rate, the number of passengers could grow up to millions in only a few years.