FOUR GENERATIONS OF COMPUTERSThe first vacuum tubes computers are referred to as first generation, and the estimated period of their use was from 1950 to 1959. is an example of these computers which could perform thousands of calculations per second. Thousands of vacuum tubes emitted a large amount of heat and burnt out frequently.milliseconds to microseconds, or millionths of a second. Second generation computers were smaller, faster and more reliable than first generation computers.The computers that were designed for use of integrated technology were called third generation computers, and the approximate time of these machines was from 1960 to 1979. They can perform many data processing operations in nanoseconds, which are billionths of a second.Fourth generation computers have now arrived, as well as integrated circuits that are being developed have been greatly reduced in size. This is due to the miniaturization, which means that the circuit is much smaller than before; as many as 100 tiny circuits are placed now on a single chip.
Everyday I use my cellphone, mp3 and notebook.They made my life easier.My cellphone is always with me, I can call my friends , play different games when I’m on a trip and I’m bored , I keep all my needed telephone numbers there and I can use it anytime and everywhere. I cannot imagine my life without music. I can relax and forget about the routine everytime I turn on my mp3 and listen to my favourite singers.I really enjoy it.I keep hundreds of songs in my mp3 and I listen again and again to the songs on it.And also , the most important of them all is my notebook.It helps me about homework , as I can search for information on net , I can relax after a hard day playing games or watching movies , I can chat with my friends , and I can find the latest news about the world. It is interesting and joyful having them as it can be both a source of information and a source of relaxing
1) Did you read Harry Potter when you were on holiday?
2) what happened to Alisher last night?
3) they have already left the bus station.
4) I saw the twins in town last week.
5) where were you yesterday?
6) granny hasnt found her glasses yet.
7) brian lived in england until he was forteen.
8) we have been to the cinema twice this mounth.
9) the weather wasnt very good last week.
10) aiguls not here, she went out.
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