change of voice — active to passive covering present perfect and past perfect

 

 "The scientists have discovered a new planet." (Present Perfect)
A. A new planet was discovered by the scientists.
B. A new planet is being discovered by the scientists.
C. A new planet had been discovered by the scientists.
D. A new planet has been discovered by the scientists.

2. "The teacher had corrected all the papers before the class started." (Past Perfect)
A. All the papers were corrected by the teacher before the class started.
B. All the papers had been corrected by the teacher before the class started.
C. All the papers have been corrected by the teacher before the class started.
D. All the papers were being corrected by the teacher before the class started.

3. "The committee has approved the new proposal." (Present Perfect)
A. The new proposal was approved by the committee.
B. The new proposal is being approved by the committee.
C. The new proposal has been approved by the committee.
D. The new proposal had been approved by the committee.

4. "The workers had completed the construction before the monsoon arrived." (Past Perfect)
A. The construction was completed by the workers before the monsoon arrived.
B. The construction has been completed by the workers before the monsoon arrived.
C. The construction was being completed by the workers before the monsoon arrived.
D. The construction had been completed by the workers before the monsoon arrived.

5. "The author has written a brilliant novel." (Present Perfect)
A. A brilliant novel was written by the author.
B. A brilliant novel had been written by the author.
C. A brilliant novel is being written by the author.
D. A brilliant novel has been written by the author.

6. "The soldiers had captured the fort before dawn." (Past Perfect)
A. The fort was being captured by the soldiers before dawn.
B. The fort has been captured by the soldiers before dawn.
C. The fort had been captured by the soldiers before dawn.
D. The fort was captured by the soldiers before dawn.

7. "The police have arrested the criminal." (Present Perfect)
A. The criminal was arrested by the police.
B. The criminal is being arrested by the police.
C. The criminal had been arrested by the police.
D. The criminal has been arrested by the police.

8. "The chef had cooked all the food before the guests arrived." (Past Perfect)
A. All the food has been cooked by the chef before the guests arrived.
B. All the food was being cooked by the chef before the guests arrived.
C. All the food had been cooked by the chef before the guests arrived.
D. All the food was cooked by the chef before the guests arrived.

9. "The students have submitted all their assignments." (Present Perfect)
A. All their assignments were submitted by the students.
B. All their assignments had been submitted by the students.
C. All their assignments are being submitted by the students.
D. All their assignments have been submitted by the students.

10. "The engineers had tested the bridge before it was opened to the public." (Past Perfect)
A. The bridge was tested by the engineers before it was opened to the public.
B. The bridge is being tested by the engineers before it was opened to the public.
C. The bridge had been tested by the engineers before it was opened to the public.
D. The bridge has been tested by the engineers before it was opened to the public.

Answer Key

  1. D
  2. B
  3. C
  4. D
  5. D
  6. C
  7. D
  8. C
  9. D
  10. C

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