PAST INDEFINITE / PRESENT PERFECT
Since computers were first introduced to the public in the early 1980’s technology (change) ____ a great deal. The first computer (be) ____ simple machines designed for basic tasks.
They (have, not) much memory and they (be, not) ____very powerful. 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.
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 book keeping. We are still playing video games, but today’s games (become) ____ faster more exciting interactive adventures.
Many computer users (get, also) ____ 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.