1)Одновременность с действием, выраженным глаголом – сказуемым

2)Предшествование действию глагола - сказуемого

3)Инфинитив имеет пассивное значение.

Предложения переведите.

1.To avoid this limitation, companies also produce DVD rewriteable devices. 2. DVD –ROM can store a large amount of multimedia software and complete full screen Hollywood movies in different languages. 3.At present researchers are looking for the most suitable chemical compounds to be used as data storages and trying to determine optimum recording conditions. 4.Lasers have been successfully employed to record information on and read it off. 5.Gigawatt lasers are not off-the-shelf items; there is no doubt they could be built if the need were strong enough. 6. Recent spectacular breakthroughs in superconductors may be compared with the physics discoveries that led to electronics and nuclear power. 7.A Dutch physicist K.Onnes found the electrical resistivity of a mercury wire to disappear suddenly when cooled bellow a temperature of 4 Kelvin .8.For almost 50 years after K.Onnes discovery theorists were unable to develop a fundamental theory of superconductivity. 9.I am glad to have been working with users. 10.I am glad to be working with professor. 11.I am glad to have invited the program. 12. He was glad to be talking with me.13. The girl was delighted to have been dancing the whole evening. 14. Nothing seems to have been forgotten. 15. We are surprised to have found you here. 16. I appear (кажется) to be working for two hours.

Задание 3.Определите функции инфинитива и переведите предложения.

1.To develop the supercomputer, highly developed electronics and new materials were required. 2.One of the best ways to keep the car speed steady is to use a computer. 3.Some materials with new useful properties may be produced in space, 4.A special electronic device signals the engine to stop. 5. To design, construct and operate a laser system is a great technological achievement. 5.A very interesting problem is to produce a practically limitless source of energy. 6.There are projects to use lasers for long distance communication. 7.To combine laser and thermonuclear reaction is a very interesting problem for the scientists in many countries. 8.To conduct physical experiments with laser beams, Russian physicists have developed large laser installations. 9.Lasers to be placed on Earth satellites will transform solar radiation into laser beams. 10. To put some projects with lasers in operation, great technological difficulties must be overcome. 11.One of the ways to make planes as economical as possible is to lighten the aircraft by using new composite materials; 12.Signals to be measured must be strong enough. 13.One of the problems scientists are working at is to transmit energy to space stations by using lasers.

Задание 4. Вставьте вместо пропусков, где необходимо, частицу to перед инфинитивом:

1.How could electricity … be used …send a message? 2.Messages to and from Europe had …been sent by ship-a journey of two or three weeks. 3.For two years Tom Watson and Alexander Bell were working together …build a machine that people could…use …talk to one another over long distances. 4.The camera-tube will…allow the user …switch from a wide view of the room to the face of the person speaking. 5.There is a mirror attachment, which allows the camera …scan documents, which may be lying on the table. 6.Sattelites help to minimize all the difficulties that may appear. 7.One CD_ROM disk can …replace 300,000 pages of text –about 500 floppies, which represents a lot of savings in databases. 8.Superconductors are extremely difficult …fabricate into wires, .9.Superconductor ceramics are substances which can… transmit electric currents with no loss of energy at temperatures much higher than conventional superconductors. 10.If a current is induced by a magnetic field in a ring of superconducting material, it will… continue …circulate when the magnetic field is removed. 11.Machine code as a means of communication is very difficult …write. 12.It will take a few more years …produce a 10-billion operations computer.13. A new cable had …be made. 14.Businessman can… use fax machines which provide electronic transmission of documents and massages over telephone lines. 15.In a few decades a new age of light may… replace the still youthful electronic age.

Задание5: Раскройте скобки, употребляя требующуюся форму инфинитива.

1.He seems (to read) a lot. 2.He seems (to read) now. 3.He seems (to read) since morning. 4.He seems (to read) all the books in the library. 5.We expect (to be) back in two days. 6 He expected (to help) by the teacher. 7.The children seem (to play) since morning. 8.I am glad (to do) all the homework yesterday. 9.I am sorry (to break) your pen. 10.I want (to take) you to the concert. 11.I want (to take) to the concert by my father. 12.She hoped (to help) her friends. 13. It seemed (to snow) heavily since early morning: the ground was covered with a deep layer of snow. 14.She hoped (to help) by her friends.15.I hope (to see) you soon. 16.They seemed (to quarrel) :I could hear angry voices from the door. 17.They are supposed (to work) at the problem for the last two months. 18.Is there anything else (to tell) her? 19. He seems (to know) French very well: he is said (to spend) his youth in Paris. 20.You seem (to look) for trouble. .

Задание 6. Составьте вопросительные предложения из приведенных ниже слов и словосочетаний:

1. Is / known /to be / the inventor of / the electric /candle /who?

2. Conditions / the body /does /the dimension of /change / what?

3. The voltmeter / used for /is /what?

4. An artificial /what /the fastest /is / to detect /satellite /way?

Задание 7. Задайте друг другу вопросы, пользуясь приведенными ниже предложениями:

Ask him⁄ her

1. Nowdays the principle of radio operation seems to be quite simple.

2. The term “radar” is known to be composed of the first letters of “radio, detection and ranging».

3. Lasers appeared to be highly useful for solving the problem of controlled thermonuclear reaction and communication.

4. A system of earth satellites appears to have solved the problem of transmitting the central TV program to any part of the World.

5. Electricity proved to be able to travel instantly over a long peace of wire. Lasers are unlikely to be used in our everyday life soon. \

6. Superconductivity is certain to bring about new discoveries in science and technology.