=>
47. Even though he has a vast fortune, he is unhappy.
48. Try as I might, I couldn't lift the suitcase.
49. Must Dr.Andrews be driven to the airport?
50. They might not have noticed that the tyre was flat.
51. All this damage can't have been done by children.
52. We must find someone to take his place./ Someone will have to be found to take his place.
53. Jack can't be at home right now.
54. Taylor must have finished all his assignments and gone shopping.
