Lesson 29

ГРАММАТИКА: Причастие и причастный оборот в функции обстоятель­ства. Независимый причастный оборот.

Section I

Ex. 1. Practise your reading.

The temperature remaining constant, the fraction of liquid molcculcs with enough kinetic energy to evaporate remains the same, and evaporation continues.

Ex. 2. State what parts of speech the following words belong to:

vapour, vaporous, vaporable, vaporization, vaporizability, vaporize, evaporate, evaporation, evaporative, evaporator

Ex. 3. Define the meanings of the word until in the following sentences:

1. Continue heating until the solution evaporates completely. 2. Don't do anything until I comc. 3. Day after day he works until night. 4. Evaporation continues until no liquid is left. 5. It was not until the atomic theory was established that chcmistiy became a nature science founded on scientific principles. 6. It was not until March 1869 that the paper on the periodic tabic was presented at the meeting of the Russian chcmical society. 7. Let us wait for him until 9 o'clock and if he doesn't comc, wc shall go away. 8. There is no suitable technique until now.

Ex. 4. Analyse the following sentence:

The temperature remaining constant, evaporation continues at a constant rate.