I. Перепишите предложения, выбрав подходящий модальный глагол. Переведите предложения на русский язык.

Example: These samples ( may / have to/ is to) be chosen deliberately. – Эти образцы могут быть отобраны (можно отобрать) произвольно.

1. The telephone was a vast improvement over the telegraph system, which (could/ may/ is able to) only transmit coded words and numbers.

2. You (has to/ is to/ may) use this instrument for measuring gas pressure.

3. We (couldn’t/ can’t/ had to) compare the properties of these substances now.

4. We (will be able to/ could/ might) experiment with different metals next week.

II. Перепишите предложения, подчеркните слова, которые выражены Participle I, Participle II или Gerund, указав, чем они являются (из вышеназванных). Переведите предложения на русский язык.

Example: There are several ways of obtaining this substance. (Gerund) – Существует несколько способов получения этого вещества.

1. In 1887 Heinrich Hertz, while trying to prove the existence of radio waves, discovered the photoelectric effect.

2. We can start testing the materials as soon as we receive them.

3. Newton’s great work published in 1687 is called “Principia”.

4. The technology of microwave radio is carried one step further by the use of communications satellites.

III. Перепишите предложения, выбрав подходящие по смыслу видовременные формы глагола. Переведите предложения на русский язык. Укажите время и залог выбранных форм глаголов.

Example: The engineer was asked / asked to test the device. (Past Simple, Passive Voice) – Инженера попросили испытать механизм.

1. We arestudying/ will be studying various electrical devices all the morning tomorrow.

2. Magnetic tape was used/ used for input, output or for storing data.

3. Our engineers have been developed/ have developed many new devices.

4. The experiments will be completed/ will complete by the end of the week.

IV. Определите глаголы-сказуемые в предложениях. Перепишите предложения, преобразуя глаголы-сказуемые из активного в пассивный залоги, сохраняя временные формы глаголов. Переведите предложения на русский язык.

Example: A.S. Popov invented theradio in 1895. – The radio was invented by A.S. Popov in 1895. – Радио было изобретено А.С. Поповым в 1895 году.

1. Scientists used lasers to measure the size of pollutants in the air.

2. The solar battery is converting the energy of sun rays directly into electric energy.

3. The students of our university study the basic concepts in computer science.

4. The students will have completed an experiment by 12 o’clock.