51. It is not the first time Tom saw this film.
52. The newspaper has already been read by Nina.
53. These movies have been seen by them.
54. The contract has been signed by me.
55. The tickets have been bought by these men.
56. This teddy bear has been bought in that shop.
57. Vicky's hat has been found by herself.
58. My bag has been lost.
59. The report has been finished.
60. I started doing my exercises three days ago.
