The horse couldn't sing “lalala “

(Dialogue between my friend Fred and me)

Fred asked me how was the performance that I saw last night. I told him I enjoyed it , but unfortunately I saw only half of it , because there were two live horses, and one of them – in the second act - jumped off from the stage and it began running around the theatre. Everybody were scared from it, and so they had to left before the end. At the end Fred said “Perhaps, the horse couldn't sing!”

Simple Past and Present Perfect 

Since computers were first introduced to the public in the early 1980's, technology (change) has changed a great deal. The first computers (be)were simple machines designed for basic tasks. They (have, not) much memory and they (be, not) weren't very powerful. Early computers were often quite expensive and customers often (pay) paid thousands of dollars for machines which actually (do) did very little. Most computers (be) were separate, individual machines used mostly as expensive typewriters or for playing games.

Times (change) have changed. Computers (become) have become powerful machines with very practical applications. Programmers (create) have created 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) have become faster, more exciting interactive adventures. Many computer users (get, also) have also got on the Internet and (begin) have begun communicating with other computer users around the world. We (start) have started to create international communities online. In short, the simple, individual machines of the past (evolve) have evolved into an international World Wide Web of knowledge.