3. Перепишите следующие предложения, определите в них функ­цию инфинитива и письменно переведите предложения на русский язык.

1. Starch is added to keep the mixture dry.

2. Tswett was the first to use the chromatographic method and realize its potential importance.

3. Soap reacts with the calcium and magnesium salts in hard water to form insoluble soaps.

4. Заполните пропуски необходимыми артиклями.

1. I don't usually like staying at … hotels, but last summer we spent a few days at …very nice hotel by … sea.

2. … tennis is my favourite sport. I play once or twice … week if I can, but I'm not … very good player.

3. I won't be home for … dinner this evening. I'm meeting some friends after … work and we're going to … cinema.

4. … unemployment is very high at the moment and it's very difficult for … people to find … work.

5. There was …accident as I was going … home last night. Two people were taken to … hospital. I think … most accidents are caused by … people driving too fast.

5. Перепишите следующие предложения, определите в них видовременные формы и залог глаголов-сказуемых и укажите их инфинитив; переведите предложения на русский язык.

a) 1. Lomonosov experimentally confirmed the Law of Conservation of Matter.

2. We shall have gathered many medicinal plants by the end of the season.

3. Electronics is becoming very important in various branches of in­dustry.

b) 1. English is spoken not only in Great Britain but also in many other countries.

2. The process of assimilation of carbon dioxide by plants had been named photosynthesis.

3. Extensive changes of scientific information are being carried out, with almost all countries of the world.

6. Перепишите предложение и поставьте: а) общий вопрос к нему; б) специальный ко всем членам предложения.

A number of authors have shown the stimulation of microsomal enzyme activities.

7. Перепишите следующие предложения; подчеркните в них Participle I, Participle II, Gerund и установите функции каждого из них, т.е. укажите является ли оно (он) определением, обстоятельством или частью сказуемого. Переведите предложения на русский язык.

1. We were sitting too far to hear the lecture.

2. The Sun's rays are the chief "chemist" synthesizing all the organic substances in plants.

3. Most of the solid material in river water used for drinking is removed by passing the mixture through a filter.

4. When given daily over considerable period of time streptomycin may cause toxic effects.

8.. Перепишите следующие предложения; подчеркните в каждом из них модальный глагол или его эквивалент. Переведите предложения на русский язык.

1. Seeds may be collected when rally matured.

2. Inhibitors are to slow down rapid chemical reactions.

1. Many substances must be dissolved before they can enter into reactions.

3. You should describe chemical properties of these substances.

9. Переведите предложения.

1. Студенты сейчас сдают экзамен.

2. Этот предмет не такой трудный как тот.

3. Заседание проводилось вчера.