The document discusses the evolution of computers from their introduction in the early 1980s to the present. It describes how early computers were simple machines with little memory and power used mostly as typewriters or for games. Over time, computers became more powerful with practical applications as programmers created useful programs. Many users now get online and communicate around the world, as the individual machines of the past have evolved into an international network of knowledge.

1. PRESENT PERFECT

2. FORM

3. USES OF PRESENT PERFECT

4. EXPERIENCES

5. TIME EXPRESSIONS

6. NOTICE

7. TASK
 The next exercise combines Present Perfect and
Past Simple.
 Complete the exercise and bring the answers to
class on a separate piece of paper.

8. TASK
 Since computers were first introduced to the public
in the early 1980's, technology ___________
(change) a great deal. The first computers
____________ (be) simple machines designed for
basic tasks. They _________ (have/not) much
memory and they
___________(be/not) very powerful.

9. TASK
 Early computers were often quite expensive and
customers often __________ (pay) thousands of dollars
for machines which actually ____________ (do) very
little. Most computers
____________(be) separate, individual machines used
mostly as expensive typewriters or for playing games.

10. TASK
 Times _________ (change) . Computers ___________
(become) powerful machines with very practical
applications. Programmers __________(create) 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 ________
(become) faster, more exciting interactive adventures.

11. TASK
 Many computer users also __________(get) on the
Internet and (begin) ___________ communicating
with other computer users around the world. We
(start) ____________to create international
communities online. In short, the simple, individual
machines of the past _______ (evolve) into an
international World Wide Web of knowledge.