\31. I've been looking for this book…………….a long time.
32. I've been working…………….I got up.
33. The kettle has been boiling…………….ten minutes
34. They have been living in Madrid ……………..1972.
35. He has been in prison……………… four years.
36. He has known about the fact …………….a long time.
37. Conditions have changed a lot ……………….we were children.
38. Our teacher has been very ill …………….the last month.
39. I haven't eaten anything …………….twenty-four hours.
40. In fact he is always very rude. We have been waiting for him …………..half an hour.
41. I haven't seen him for three years. It is because I haven't been there…………..I left school.
42. I have been trying to mend this old fashioned car……………… hours.
43. One of my friends has been teaching in Tokyo…………….. three years. I haven't met him since last
year.
44. I haven't enjoyed myself…………….two weeks since I heard that my final exam grades were low.
45. 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.