=>
31. The documents were being delivered to the department by Martha.
-> bị động QKTD was/were being V3/ed
32. The palace was being designed by a french architect.
-> bị động QKTD was/were being V3/ed
33. The report was being written by Mr Brown at 8 p.m yesterday.
-> bị động QKTD was/were being V3/ed
34. By whom were those windows being painted?
-> bị động QKTD was/were S being V3/ed?
35. All the workers of the plan were being instructed by the chef engineer.
-> bị động QKTD was/were being V3/ed
36. Dinner wasn't being eaten by them.
-> bị động QKTD was/were being V3/ed
37. The gate was being painted by us.
38. He wasn't being driven home.
-> bị động QKTD was/were being V3/ed 
39. The dogs were being fed by him.
-> bị động QKTD was/were being V3/ed
40. Were these lines being read by her?
-> bị động QKTD was/were S being V3/ed?
41. The report has been finished by Beth.
-> bị động HTHT have/has been V3/ed
42. My briefcase has been taken.
-> bị động HTHT have/has been V3/ed
43. The report has been finished by her at noon.
-> bị động HTHT have/has been V3/ed
44. Five suspects have been arrested by the police.
-> bị động HTHT have/has been V3/ed
45. The bill has been paid by Kerrie.
-> bị động HTHT have/has been V3/ed
46. A hamburger has been eaten by me.
-> bị động HTHT have/has been V3/ed
47. The present has been opened by me.
-> bị động HTHT have/has been V3/ed
48. The book hasn't been read by them.
-> bị động HTHT have/has (not) been V3/ed
49. The parcel hasn't been sent.
-> bị động HTHT have/has (not) been V3/ed
50. Đề thiếu