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Three Basic Developments of Electronics

Electronics has probably undergone more revolutionary steps than any other industry. There are three basic developments in electronics that have given birth to three completely new technological industries. The first large technological innovation was the introduction of radio-frequency energy. Microwaves alone offer unparalleled opportunities for communications to business and industry. The second of these was of course the transistor and the associated solid-state circuit based on semi­conductor technology. The third and latest technology is the laser. It is a light amplifying device having a broad range of applications. Lasers have potentialities for medical applications where the extremely narrow high intensity beam can be used for surgery or medical treatment.

УЭ – 1

The present simple (indefinite) tense (active)

Ex 2

London is not (isn't) noisy at weekends. My friend doesn't like traffic because he doesn't like driving slowly. But he usually doesn't derive fast and carefully. My wife doesn't drive as well as my friend. She usually doesn't drive fast and carelessly. She doesn't stop suddenly and turns too quickly. I am not comfortable with my friend because he doesn't drive carefully.

Ex. 3

1. When do we go to the party? Where do we go today? 2. When does the bar close? 3. Where do I go to send a message? 4. What does my son want to buy? 5. How much time does it take me to get there?

Ex 4

1.He always spends his holiday by the sea.

2. Even though she does not study very hard, she usually does well in exams.

3. Although she does not have got a job, she hopes for the best.

4. In spite of her young age, my sister plays tennis very well.

5. You think you will be a manager in five years time? - I believe so.

6. She hopes she will earn a lot of money in future.

7. I don't like him. He's one of those people who only talks and talks but does nothing,

8. I don't think that the hunting of wild animals can be justified in any way.

9. How do you get on with your parents, brothers and sisters?

10. A family Sunday dinner symbolizes our importance to one another in good times and bad. It serves us touch- stone that helps family-members gather to share week's news and plan for future. Do you agree with me?

The past simple (indefinite) tense (active)

Ex. 3

You didn't get up late yesterday. Did you get up late yesterday?

You didn’t spend too much money at the shop. Did you spend too much money at the shop?

He didn't ring me up in the evening. Did he ring me up in the evening?

They didn't tell us about the marriage. Did they tell us about the marriage?

We didn't invite them to the concert. Did we invite them to the concert?

Ex. 4

My name is Robinson Crusoe and I was born in the city of York. When I was eighteen years old I went to the city of Hull and there I met a boy whom I knew. His father was the captain of the ship. This boy said to me, “Will you come with us, Bob?” After five days we came to a land and stopped in the mouth of a little river. Then a huge wave came upon us, turned over the boat and threw us all into the water.

Ex. 5

1. I didn't go to the university yesterday. We didn't have lessons. 2. The seсretary typed some documents last week. 3. He rang up too late yesterday. 4. The text was difficult and I had to make use of a dictionary. 5. Did you listen to the latest news? - Certainly, I always listen to the news in the evenings. 6. Yesterday we had a meeting. My chief maid a speech. Everybody liked it. 7. Today I left home at 8.20 and came to work fifteen minutes earlier. 8. Last year my sister left for London. She got fixed up in a job and found friends. 9. In summer we rested at seaside and got a great pleasure.

Дата добавления: 2015-05-31