"To be" and its functions. "To have" and its functions

III. Compare the pairs of sentences paying special attention to the tense form of a predicate in the main clause and sub clause.

1.It is interesting to mention that at least a hundred organic compounds are added every day. It was mentioned in the report that more than 3, 000,000 organic compounds were already known.

2. Everybody knows that television is developing swiftly in our country. We heard that the new television station was being equipped with the most modern transistor devices.
3. It is stated in the newspaper that in recent years scientists have been looking for new means of generating electricity. The numerous experiments made showed that scientists had succeeded in developing more effective processes of producing electricity directly from fuel.
4. It is stressed in the article that spaceship engineers will make use of polymers that can withstand high temperatures and cosmic radiation. The methods developed and the results obtained proved that there would be large but light ships made of plastics in future.


IV. Translate the sentences paying particular attention to the modal verbs and its equivalents in the sub clauses.

1. 
   1. The newspaper wrote that in the modern world people could not imagine their life without radio and television. 2. The teacher said that we might complete our drawings the next week. 3. Like all true scientists Einstein knew that he had to be patient in his researches. 4. It was decided that every student was to carry out such an experiment.
   

2. 
   1. Mendeleyev predicted that there must exist a few unknown elements with quite definite properties. 2. It was said at the conference that care should be taken to obtain a sufficient amount of light in buildings where men are at work. 3. The chief engineer explained to the students that they always ought to know the properties of materials and the conditions under which the part has to be worked.