Compléter Present Perfect vs Past SimpleVersion en ligne review of the present perfect and past simple par Marta Teacher 1 also have changed have have were got were were have have were begun have started created have become paid have did changed have evolved weren't become has Since computers first introduced to the public in the early 1980's , technology a great deal . The first computers simple machines designed for basic tasks . They didn't much memory and they very powerful . Early computers often quite expensive and customers often thousands of dollars for machines which actually very little . Most computers separate , individual machines used mostly as expensive typewriters or for playing games . Times . Computers powerful machines with very practical applications . Programmers a large selection of useful programs which do everything from teaching foreign languages to bookkeeping . We are still playing video games , but today's games faster , more exciting interactive adventures . Many computer users on the Internet and communicating with other computer users around the world . We to create international communities online . In short , the simple , individual machines of the past into an international World Wide Web of knowledge .
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