14.2. Поставьте глаголы в скобках Simple Past или Present
Perfect
I. 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 ior bacic
tasks.
3. They (have, not) much memory and they (be. not) very powerful
4. Early computers were often quite expensive and customers otten
(pay) thousands of dollars for machines which actually (do ) very little.
5. Most computers (be) separate, individual machines used mostly
as expensive typewriters or for playing games.
6. Times (change). Computers (become) poweriul machines with
very practical applications.
7. Programmers (create) a lot of useful programs which do every-
thing 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 lntemet and (begin)
I communicating with other computer users around the world.

I. Since computers were first introduced to the public in the early 1980's. technology (has changed) a great deal. 2. The first computers (were) simple machines designed for bacic tasks. 3. They (did not have) much memory and they (were not) very powerful. 4. Early computers were often quite expensive and customers otten (paid) thousands of dollars for machines which actually (did ) very little. 5. Most computers (were) separate, individual machines used mostly as expensive typewriters or for playing games. 6. Times (have changed). Computers (have become) powerful machines with very practical applications. 7. Programmers (have created) a lot of useful programs which do every- thing from teaching foreign languages to bookkeeping. 8. We are still playing video games, but today's games (have become) faster and more interesting. 9. Many computer users (have also got) on the lntemet and (begun) communicating with other computer users around the world.