( )
| Present | Past | Future | |
| can | could | shall/will be able to | |
| I can skate. | I could skate. | I'll be able to skate 1 there. | |
| may | was allowed, were allowed | shall/will be allowed | |
| You may go home. | I was allowed to go home. ( ..) | You will be allowed to go home. ( ) | |
| must | __ | -- | |
| , | I must do it now. | ||
| have to, has to | had to | shall/will have to | |
| I have to help him. | I had to go there. / | He will have to go there. / |
some, any, no
some ,
| There are some books on the table |
| ( ) |
| Can I have some tea? |
any ,
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1
1. :
1. What laws did Newton discover?
2. Can you formulate the Law of Universal gravitation?
ISAAK NEWTON
1. Isaak Newton was born in 1642 in the family of a poor farmer. The boy began his first scientific experiments at school.
2. While studying at Cambridge University, Newton formulated the binomial theorem. In 1662 Cambridge was closed because of the plague and Newton returned to his native village. For the next two years he devoted himself to scientific experimentation.
3. Newton's great discovery was the law of decomposition of light. The scientist proved that the white light of the sun is composed of rays of light of all colours of the rainbow. He also discovered the Law of Universal Gravitation which states that "every particle of matter is attracted by every other particle of matter with a force inversely proportional to the square of their distance apart".
4. Newton applied the principle of gravitation to prove that the power which guides the moon around the earth and the planets around the sun is the force of gravity. Another application of the law of universal gravitation was Newton's exploration of the tides.
5. Newton was highly honoured by his countrymen and in 1703 he was elected President of the Royal Society. Sir Isaak Newton died in 1727 and was be ried in Westminster Abbey.
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2. 3, 4:
3. :
1. Newton (was performed, performed) many experiments with light.
2. When Cambridge (was closed, closed) in 1662, Newton returned to his native village.
3. Mass (is measured, measured) in grams or kilograms.
4. , :
1. My parents want me to become a chemist.
2. He is believed to be a very talented person.
3. Newton is considered to be one of the greatest English scientists.
5. :
1. To carry out this experiment will take you a lot of time.
2. The experiment to be carried out in our laboratory is very important.
3. He forgot to register the results of the experiment.
6. - Past Indefinite Tense ( ), can, may, must :
1. He must work hard to finish his experiment.
2. 1 can devote myself to scientific work.
3. You may repeat your experiment.
7. some, any, no:
1. The Metric System has (some, any, no) advantages over the English System.
2. Do you remember (some, any, no) facts from Newton ' s biography?
3. The young engineer had (some, any, no) experience in such work.
8. a) . , :
The two most common types of engines are the petrol engine and the diesel engine. Petrol engines are lighter and smaller than diesel engines. That makes them cheaper, and that is why most cars and motorbikes use petrol engines.
On the other hand, diesel engines use less fuel and last longer than petrol engines. They are also safer and less dangerous. They are widely used in large vehicles such as trucks and trains.
) :
1. The engine (cooled, is cooled) by water from the radiator.
2. Most cars (use, are used) petrol engines.
3. The electricity (stored, is stored) in the battery.
) , :
1. Rudolf Diesel is known to be the inventor of the diesel engine.
2. We expect them to buy a new car.
3. This motor car is considered to be safe.
