Очередное задание

Task 6. Rewrite from the text all sentences with modal verbs and replace them their equivalents.

Перепишите из текста все предложения с модальными глаголами и заменить их на их эквиваленты.

Как распознать в тексте модальные глаголы?

Помогите найти их, или подскажите как искать?

текст под катом

1. In the language of science energy is the ability to do work. There are various forms of energy, such as heat, mechanical, electrical, chemical, atomic and so on. One might also mention the two kinds of mechanical energy - potential and kinetic, potential energy being the energy of position while kinetic energy is the energy of motion.

2. It is well known that one form of energy can be changed into another. A waterfall may serve as an example. Water falling from its raised position, energy changes from potential to kinetic energy. The energy of falling water is generally used to turn the turbines of hydroelectric stations. The turbines in their turn drive the electric generators, the latter producing electric energy. Thus, the mechanical energy of falling water is turned into electric energy. The electric energy, in its turn, may be transformed into any other necessary form.

3. When an object loses its potential energy, that energy is turned into kinetic energy. Thus, in the above - mentioned example when water is falling from its raised position, it certainly loses its potential energy, that energy changing into kinetic energy.

4. We have already seen that energy of some kind must be employed to generate the electric current. Generally speaking, the sources of energy usually employed to produce current are either chemical, as in the battery, or mechanical, as in the electromagnetic generator. Chemical sources of current having a limited application, the great quantities of electric energy generated today come from various forms of mechanical energy.