| Exercise 13. Раскройте скобки, употребляя глагол в форме Past Simple или Present Perfect.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. 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 bookkeeping. 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.
Exercise 14. Раскройте скобки, употребляя глагол в форме Past Simple или Present Perfect.
| 1. I______________ already (to do) my homework. Now I can go for a walk.
| | 2. I (to do)_______________ my homework yesterday.
| | 3. He______________ just (to come) home.
| | 4. He (to come)______________ home a minute ago.
| | 5. Nick (to play)________________ football yesterday.
| | 6. She_____________ already (to come) from school. Now she is doing her homework.
| | 7. I (to read)_____________ this book last year.
| | 8. I'm sorry. I (not to do)______________ my homework
| | 9. He is not at school today, he (to fall) ill____________ . — When he (to fall) ill?__________— He (to fall)____________ ill yesterday.
| | 10. At last I (to do)______________ all my homework: now I shall go out
| | 11. The rain (to stop)_____________ but a cold wind is still blowing.
| | 12. We_______________ already (to solve) the problem.
| | 13. He_______________ just (to finish) his work
| | 14. Where you (to put) the newspaper?________________________
| | 15. What books____________ you (to read) when you (to live)________in the country?
| | 16. They_____________ (not yet to come) from the south
| | 17. He (to be)________________ ill last week, but now he (to recover)_____________-
| | 18. You (to book) tickets?_____________ — Yes, I (to book)__________them several days ago
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Exercise 15. Раскройте скобки, употребляя глагол в форме Past Simple или Present Perfect.
| 1) I_________________ (see) three police cars this morning.
| | | | 2) After he__________ (arrive) home, he___________ (unpack) and_________ (go) to bed early.
| | | | 3) A:What's wrong? B: I____________ (break) a glass.
| | | | 4) My grandparents only__________ (know) each other for a few months before they_______________ (get) married.
| | | | 5) I________________ (be) in London for three years. I love it here.
| | | | 6) We__________________ (see) Julie last night.
| | | | 7) He_______________ (be) a teacher before he____________ (become) a musician.
| | | | 8) When the boss___________ (walk) into the room we__________ (know)someone was going to get fired.
| | | | 9) The children____________ (break) a window in the school last week.
| | | | 10) He____________ (see) that film last year.
| | | | 11) Lucy_____________ (break) her leg, so she can't come skiing.
| | | | 12) Julie___________ (arrive) - come and say hello.
| | | | 13) They_______________ (be) cold when they____________ (arrive) home.
| | | | 14) Jack_____________ (break) his arm when he_________ (fall) off a horse in 1995.
| | | | 15) I__________ (know) about the problem for months, but I_________(not/find) a solution yet.
| | | | 16) A:When______________ (you/arrive) B:At 10pm last night?
| | | | 17) She_____________ (be) a teacher for ten years, and she still enjoys it.
| | | | 18) I______________ (not/see) the sea before.
| | | | 19) How long_______________ (you/know) Jill? I know you see her often.
| | | | 20) A:Hello B:Hi Mum, it's me. I just want to say I_____________ (arrive) safely and everything is fine.
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Date: 2016-01-05; view: 1678
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