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computer is an electronic device that can receive a set of instructions called program and then carry out them. the modern world of high technology could not be possible without computers. different types and sizes of computers find uses throughout our society. they are used for the storage and handling of data, secret governmental files, information about banking transactions and so on.
computers have opened up a new era in manufacturing and they have enhanced modern communication systems. they are essential tools in almost every field of research, from constructing models of the universe to producing tomorrow's weather reports. using of different databases and computer networks make available a great variety of information sources.
there are two main types of computers, analog and digital, although the term computer is often used to mean only the digital type, because this type of computer is widely used today. that is why i am going to tell you about digital computers.
everything that a digital computer does is based on one operation: the ability to determine: on or off, high voltage or low voltage or — in the case of numbers – zero or one or do-called binary code. the speed at which the computer performs this simple act is called computer speed. computer speeds are measured in hertz or cycles per second. a computer with a «clock speed» of two thousand mhz is a fairly representative microcomputer today. it is capable of executing two thousand million discrete operations per second. nowadays microcomputers can perform from eight hundred to over three thousand million operations per second and supercomputers used in research and defense applications attain speeds of many billions of cycles per second.
digital computer speed and calculating power are further enhanced by the amount of data handled during each cycle. except two main types of computers, analog and digital there are eight generations of digital computers or processing units.
1) Her father is not watching TV at the moment. He is sleeping because he is tired
2) Where does your uncle work? He works at school.
3) Is your friend doing his homework now?
4) When do you usually come home from school? I come at four o'clock.
5) My sister is not playing the piano now. She plays the piano in the evening.
6) Are you reading a magazine and thinking about your holiday at the moment?
7) I am siting in a waiting room at the dentist now.
8) When do you listen to the news on the radio?
9) Are you playing chess now?
Ex.1
1.many birds fly south in winter.
2. Ken writing a book about the Aztec Indians. He`ll finish it soon.
3. Mandy usually sits with Sandra in history classes. But today Sandra is absent, so Mandy will sit with Beth.
4. We don't wear uniforms to school.
5. “Great John! I see you are working very hard today! "
6. My brother doesn't listen to pop music, but today he listens to Madonna.
7. I don't understand what you are saying. Please speak more clearly!
8. I support Greenpeace because I believe in their philosophy.
9. Our teachers giving us a test twice a month.
10. "What are you doing?" "I taste the soup to see if it has enough salt."
Ex.2
1.Be careful! You will hurt yourself with scissors.
2. Come quickly! Look, snow out!
3. I do not know the answer, so I am looking it up.
4. The buses leave from the depot at 9 o'clock every day.
5. When I grow up, I will become an astronaut.
6. If you keep on play with this knife, you will cut yourself.
7. I will wear my new dress to the party tonight!
8. Jane will visit us these days and we are having a wonderful time together!
9. Don't worry! The plane will take off in three hours. We have a lots of time!
10. Jenny will be back soon. You could wait for her if you like.
Ex.3
1.My father took me to my first football game ten years ago.
2. When I arrive home, Susan cries.
3. Luke and Tony have a fight over Sheila at the pub last night.
4. I wrote an email when a dog comes in.
5. When I was young, my mum walk me to school every morning. In the afternoon my grandmother picked me up because my mother had to work.
6. While I driving to work, it startted snowing.
Ex.4
1. My father will take us to the park tomorrow.
2. Mary is doing her homework for tomorrow.
3. We live at 17 Burrows Street.
4. All day yesterday they were preparing for the English test.
5 . My mother worked in a good store before she was married.
6. We clean the house every day.
7. “Don't worry John, I'll pick up my dry cleaning on my way home. "
8. I will go to China if I win a lot of money.
9. My brother goes to school every morning.
10. When she was crossing the road, she was hit by a motorcycle.
11. When she arrives, we will ask her about it.
12. I will visit her while I am in Athens.
13. Ten minutes ago he took out the trash.
14. Do you get a lot of gifts for your birthday?
15. I will help with the laundry if I have time.
Ex.5
1.c
2.b
3.b
4.c
5.c
6.c
7.a
8.c
Объяснение: