Поставьте глаголы в скобках в simple past или present perfect: 1. since computers were first introduced to the public in the early 1980"s, technology (change) a great deal. 2. the first computers (be) simple machines designed for basic tasks. 3. they (have,not) much memory and they (be,not) very powerful. 4. early computers were often quite expensive and customers often (pay) thousands of dollars for machines which actually (do) very little. 5. most computers (be) separate, individual machines used mostly as expensive typewriters of for playing games. 6. times (change). computers (become) powerful machines with very practical applications. 7. programmers (create) a lot of useful programs which do everything from teaching foreign languages to bookkeeping. 8. we are still playing video games, but today”s games (become) faster and more interesting. 9. many computer users (get, also) on the internet and (begin) communicating with other computer users around the world.

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Ответы на вопрос:

Muhamed2005

4,4(7 оценок)

1) changed 2) been 3)hadn't

alexandrapavlov1

4,5(13 оценок)

1.have we been waiting for you since 12 o’clock? yes, we have. no, we have not.

2. has he been working here for 2 hours? yes, he has. no, he has not.

3. have they been sleeping for a long time? yes, they have. no, they have not.

4. have i been waiting here since three o’clock? yes, i have. no, i have not.

5. has that noise been going on since they came home? yes, it has. no, it has not.

6. has the telephone been ringing for five minutes? yes, it has. no, it has not.

7. has he been coming here day after day for years? yes, he has. no, he has not

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