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28. The teacher has told a story → 29Somebody has taken my books away. →. 30.. Somebody takes my books away. - 31.Somebody took my books away. 32. They clean the wall before they paint it. → 33. They cleaned the wall before they painted it. → 34. Mr. Cole visited John at the weekend. → 35.. Mr. Cole usually visits John at the weekend. → 36. Mr. Cole has visited John many times → 37. Science and technology have completely changed human life 38.. They found the book on the floor → 39. They have found the keys in the drawer → 40. They don't finish the work in time → 41. Do You finish the work in time? →→→ 42. Did You finish the work in time? → 43. You finish the work in time → 44. They didn't call my name. → ... . 45.. They don't call my name →. 46 They haven't called my name 47. Has she written a poem? →→→ →→ 48. Has your mother made a big cake for the next party? 49. Did your mother make a big cake for the party? 50.Does your mother make a big cake for the party? 51.. Please wait here until they examine your luggage
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