EX 1: 1. They have been living in Madrid ________ 1972. 2. He has been in prison ________ four years. 3. He has known about the fact ________ a long time. 4. Conditions have changed a lot ________ we were children. 5. Our teacher has been very ill ________ the last month. 6. I haven't eaten anything ________ twenty-four hours. 7. In fact he is always very rude. We have been waiting for him ________ half an hour. 8. I haven't seen him for three years. It is because I haven't been there ________ I left school. 9. I have been trying to mend this old fashioned car ________ hours. 10. One of my friends has been teaching in Tokyo ________ three years. I haven't met him since last year. 11. I haven't enjoyed myself ________ two weeks since I heard that my final exam grades were low. 12. I know that you have never seen a lion ________ you were born. Then now I say that we can go to the zoo and see one. 13. The police have been looking for him for two weeks ________ he escaped from the prison. 14. He hasn't spoken to me even a word ________ the last meeting. 15. I haven't phoned him ________ a week. 16. He has been the principal of our high school ________ 1988. 17. Dean has been learning Japanese ________ two years.