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Here are the corrected sentences: 1. Mr. John is principal. 2. Mr. Smith has been teaching at this school since 2001. 3. My father doesn't watch TV every night. 4. I met Arthur three weeks ago. 5. Don't call me in the afternoon. I'm usually away in the afternoon. 6. Mr. Clark was in New York 2 months ago. Mr. Rossi was in New York until 2 months ago. 7. John has been driving that car ever since I've known him. 8. People speak English in most of Canada. 9. Up to then I had never seen such a fat man. 10. I didn't see him last Monday. 11. I think he will leave as soon as he knows the news. 12. He will come and see you soon. 13. My mother is coming to stay with us next weekend. 14. Where will you spend your old age next summer? 15. Violets bloom in spring. 16. We haven't lived in England for two years now. 17. I will never forget what you just told me. 18. They are preparing the Christmas dinner at the moment. 19. When I last stayed in Cairo, I rode to the Pyramids on a camel that my friend had borrowed the day before. 20. Our teacher told us yesterday that he had visited England in 1970. 21. George has been working at a university so far. 22. When he lived in Manchester, he worked in a bank. 23. Birds build their nests in summer and fly to the South in winter. 24. I lost my key. Can you help me look for it? 25. My father hasn't smoked for 5 years. 26. How long have Bob and Mary been married? 27. Have you received any letters from your parents yet? 28. My brother joined the army when he was young. 29. Do you remember my name or will you forget it someday? 30. Miss Lee often wrote when she was on holiday. 31. He left home two weeks ago and we haven't heard from him since then. 32. Did you speak to Mrs. Baker yesterday? 33. No, I haven't seen her for a long time. I can't remember when I last saw her. 34. Columbus discovered America more than 400 years ago. 35. Bill said he had forgotten to buy a dictionary. 36. We haven't seen them for a long time. 37. Kite and I will wait right here until you get back. 38. He'll leave as soon as he hears the news. 39. How long have you been studying in this school? 40. We haven't received any letters from him since he left four months ago. 41. Where are you? I'm upstairs. I'm having a bath. 42. I will speak to you about that matter after the meeting tonight.