Present Simple

2. A crystal oscillator _____ a screening chamber containing a quartz crystal. Present Simple

3. Electrons _____ particles that form a part of all atoms. Present Simple

4. The first computers ___ for single users only. Past Simple

5. Next messaging ____ the smart way to communicate. Present Simple

Задание 3. Поставьте глагол to be в Present Continuous (am doing, is doing, are doing), Past Continuous (was doing, were doing), Future Continuous (shall be doing, will be doing).

1. An electromagnetic wave is invisible traveling at the speed of light. 2. An electromagnetic wave is carrying information from a transmitter to a receiver. 3. The division between “minis” and “macros” is now disappearing.

Задание 4. Переведите предложения с глаголом to be на русский язык, обращая внимание на его употребление в Passive Voice

1. After heating the cathode, the electron emission from its surface is produced. 2. The four states of matter are known, they being: solid, liquid, gas and plasma. 3. Solid-state devices are made of semiconductor crystals. 4. Silicon and germanium are found to be the two well known materials in the manufacture of crystal devices. 5. The normal work of silicon semiconductor devices can be guaranteed at temperatures of the -40 C to + 125 C range. 6. Different means is required to reduce noise in radio systems. 7. The characteristics of semiconductor and vacuum diodes can be represented as mathematical equations. 8. The free electrons in materials are held within the bounds of the materials by surface restraint. 9. The valve production is connected with evacuation processes. 10. Valve characteristics must be paid great attention to. 11. The tetrode was operated as an amplifier under certain conditions. 12. The effect of a secondary emission was accompanied by other changes of valve characteristic. 13. Collisions between electrons can be neglected.

Задание 5. Переведите предложение с глаголом to be на русский язык, обращая внимание на его употребление в модальном значении “должен, обязан по приказу, договоренности, расписанию”

1. The function of the transmitting station is to modulate the carrier wave and then radiate it for the purpose of reaching the receiver.

Задание 6. Выберите один из предложенных вариантов:

1. A: I have a Physics exam tomorrow.

B: Oh dear. Physics is/ are a very difficult subject.

2. A: My office is three miles from my house.

B: Three miles is/ are a long way to walk to work.

3. A: My little brother has got measles.

B: Oh dear. Measles is/ are quite a serious illness.

4. A: Jane looked nice today, didn't she?

B: Yes. Her clothes were/was very smart.

5. A: I've got two pounds. I'm going to buy a CD.

B: Two pounds is/are not enough to buy a CD.

6. A: The classroom was empty when I walked past.

B: Yes. The class was/were all on a school outing.

7. A: Have you just cleaned the stairs?

B: Yes, so be careful. They is/are very slippery.

8. A: Did you ask John to fix your car?

B: Yes. His advice was/were that I take it to a garage.

9. A: Did you enjoy your holiday?

B: Yes, thank you. The weather was/were wonderful.

10. A: These trousers is/are very old.

B: You should buy a new pair.

Задание 7. Составьте вопросительные предложения из предложенных ниже слов и словосочетаний.

1. there/ types/ of unit crystal patterns/ are/ many?

2. materials/ used to produce/ what/ commonly/ are/ a good thermionic cathode?

3. the work/ is/ function/ what/ of the tungsten?

4. the main/ disadvantage/ is/ what/ of the oxide cathode?

5. is/ the difference between/ what/ a diode and a triode?

6. the total energy/ is/ what/ of the electron equal to?

7. can/ be/ electrons/ made to move/ how/ inside a bulb in a fairly unimpeded manner?

8. are/ usually produced/ charge carriers/ how/ in a crystal sample?

9. are/ where/ potentials/ in a valve applied?

10. are/ why/ to be used/ chemically inactive gases/ for gas-filled valves?

Приложение 1

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