Инфинитив (The Infinitive)

(УПГ: §9.7, 9.7.1, 9.7.2, 9.7.3, 9.7.4. стр. 46-51)

Упражнение 42. Переведите предложения с инфинитивом в начале предложения (подлежащее или обстоятельство).

1. To recognize a substance it is not necessary to examine all its properties.

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2. To improve the results of the experiment the researchers have studied theoretical and practical programs.

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3. To prepare this salt in our laboratory was not a difficult task.

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4. To get to the laboratory building I took a bus.

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5. To obtain good results they made many experiments.

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6. To boil water before drinking is necessary._____________________________

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7. To know the Periodic Law is very important for every chemist.

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8. To buy medicines a patient goes to a pharmacy.

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9. To determine the proportion of various chemical elements present in the human body is comparatively simple.

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10. To develop a vaccine against any parasite is a long-term effort that can take from 20 to 30 years.

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11. To distinguish the iodine solution from the bromine one we must use starch as an indicator.

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Упражнение 43. Подчеркните в каждом предложении инфинитив. Переведите предложения, учитывая его функцию (подлежащего, дополнения, определения, обстоятельства, части сказуемого).

1. To review the new words before every lesson is very useful.

Повторять слова перед каждым занятием очень полезно._______________

2. To establish the molecular weight of oxygen means to find the number of atoms in the oxygen molecule.

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3. The solution to be filtered was poured into a flask.

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4. It is difficult to translate text containing too many unknown words.

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5. The first man to study thoroughly the electric properties of solution was M. Faraday.

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6. The method to be used in the experiment is effective.

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7. In order to come to the lectures in time I left home earlier than usually yesterday.

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8. The task of the experiment was to observe the properties of these two elements.

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9. Are you ready to answer the questions?

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10. The student was asked to translate the text.

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11. He was the next to answer.

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Значения глаголов to be и to have

(УПГ: §11.1, 11.2 стр.65-66)

Упражнение 44. Выпишите номера предложений, где глаголы to be, to have имеют значение долженствования. Переведите эти предложения.

1. The students had to distil some water. 2. The scientist is to make a report at the scientific conference. 3. We have obtained salt by evaporation under reduced pressure. 4. Every change of temperature was watched attentively. 5. They had a very interesting lecture on chemistry yesterday. 6. One has to take into account that sulphuric acid is a strong acid. 7. They had all the necessary substances for the experiment. 8. The atomic theory has become one of the greatest achievements in the history of human thought. 9. Most substances are complex in composition and can be decomposed to form two or more simple substances. 10. The substance which is to be purified is placed into glass vessel. 11. Water to be used for drinking should be thoroughly purified.

1. Студент должен был (вынужден был) продистиллировать

(перегнать) немного воды.___________________________________________

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Предложение

(УПГ: §10 стр.55)