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6.____Does_______he (play)_____play_____sports?.
7.________Do______your students (play)_____play_____soccer every afternoon?
8. John …………….has seen……..…..(see) that film several times.
9. They ……………have lived………..……(live) in this street for a long time.
10. She ………………hasn't spoken……..(not speak) to me since last week.
11. We ……………………have studied……..…………..(study) every lesson in the book, so far.
12. Up to now, John ………………has worked…………….(work) very hard.
13. They …………sold…………..(sell) their house several days ago.
14. John …………has worked…………..(work) for this company since 1980.
15. Linda is working in this department. She ………has worked…..…………..(work) here for two years.
16. Many people in this class ………have seen…..…...(see) this beautiful house several times.
17. They ………lived……..………(live) in London from 1970 to 1990.
18. They ………have lived..……….(live) in China since 2000.
19. This boy ………hasn't finished……..……….(not / finish) his homework yet.
20. I …………have spoken.….... (speak) to him about your work several times already.
21. he ………had recieved….….(receive) a letter just a few minutes ago.
22. It’s the third time you ………have lost…….……….(lose) your key.
23. This is one of the best books I …………have ever read……….(ever read).
24. You ………Did you put…..……….(put) your book on my desk last night?
25. He …isn't.. (not be) at home now. He …………is playing…….(play) soccer outside.
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Negative effects : politic, law, criminal and food. It is good controlsystem.