Voice change, present perfect (has/have verb-ed <-> has/have been verb-ed)

1. A.
   Someone has completed the task.
2. B.
   Someone has been completing the task.
3. C.
   Someone will be completing the task.
4. D.
   Someone completes the task.

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1. A.
   He was making a new invention.
2. B.
   He has made a new invention.
3. C.
   He had been making a new invention.
4. D.
   He were making a new invention.

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1. A.
   A new species of marine life was recently discovered in the unexplored depths of the ocean by scientists.
2. B.
   A new species of marine life had recently been discovered in the unexplored depths of the ocean by scientists.
3. C.
   A new species of marine life has recently been discovered in the unexplored depths of the ocean by scientists.
4. D.
   A new species of marine life was recently being discovered in the unexplored depths of the ocean by scientists.

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