Завершіть речення як у зразку.

Model: This year he must work very hard, but a year ago

he didn't have to.

1. Now I must help her but last year I... 2. This term the students must attend the lectures in the evening but last term they... 3. We must carry out a number of experiments but a year ago we..

Ex. 1 Знайдіть речення в яких дієслово" tobe" є модальним

1. The laboratory was lit up very well. 2. This substance is to be heated to a high temperature. 3. In this experiment we were to find out all the properties of this substance. 4. This example was referred to by our teacher. 5. Hot water is to be poured in a flask. 6. If dry chlorine gas is passed into the liquid trichloride in a cooled container, the pentachloride is formed. 7. Silver is not attacked by oxygen under ordinary conditions. 8. The use of this gas is to be omitted as it is very harmful. 9. If the boiling point of the solution is to be established, you should carry out this experiment. 10. Many ores which are to be refined often contain considerable quantities of impurities. 11. He is working at a very important experiment, it is to help our researchers to finish their work. 12. The vapor pressure of this unstable phase is greater than that of the stable phase at the same temperature

Поставте речення в пасивному стані як у зразку

Model I: They asked him to investigate this method. He was asked to investigate this method (by them).

1. They showed us a new laboratory of organic chemistry. 2. I told him the news at once. 3. The teacher gave the students many interesting books. 4. I shall answer all your questions in two days. 5. They will tell her the results when the work is over.

Model II: They sent for the teacher. The teacher was sent for.

1. Everybody spoke about this new method of production.

2. He looked at this modern machine with great interest. 3.We shall send for the doctor if he feels bad. 4. They always listen to him very attentively.

Ex. 2. Перекладіть речення.

1. The rate of this reaction can be strongly influenced by high temperature. 2. The changes in these parameters during decomposition were followed by a number of other changes.3.Common salt was acted upon by sulphuric acid and hydrogen chloride was produced. 4. His work in this field can berelied on. 5. They were told about the new discoveries in oil production. 6. The change in colour was followed by the change of other properties. 7. Fermi is looked upon as an outstanding physicist of our time. 8. The results of their investigation can be referred to. 9. I was asked to attend his lecture on chemistry. 10. Liquid solutions will be dealt with in this chapter. 11. The qualitative examination of this compound is followed by the quantitative one

Ex. 3: Перекладіть речення., звертаючи увагу на слово" much":

1. This experiment is much more tedious and time consum­ing than the first one. 2. That work was much more interest­ing for us though it was more difficult. 3. The solubility of helium is much less than that of nitrogen. 4. It would be noted that as much as 20 per cent of this solvent was used. 5. He worked very much last year and could fulfil as much as 50 per cent of his work. 6. Much attention has been paid to the development of nuclear physics in our country. 7. Much research in the field of atomic structure has been carried out recently. 8. As much as 30 per cent of water was evaporated from this solution upon heating. 9, This new discovery is much spoken about.

Ex. 4 Перекладіть речення., звертаючи увагу на слово" mean"

1. In mechanics, force does not mean strength. 2. Elec­trolysis is a process by which a chemical reaction is carried out by means of the passage of an electric current. 3. This means that all the atoms of any element have the same properties. 4. It is generally possible by suitable means to separate the constituents of solutions. 5. Dissociation means the separa­tion of a molecule into its original constituent atoms. 6. Anumber of various complicated problems has been solved by means of computers. 7. At any given temperature the mole­cules of gases have the same mean kinetic energy

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