Question

The dog was seen by the vet. in active voice

Answer 1

The vet started a check up on the dog.
The vet saw the dog.

Answer 2

In order to answer this question, we need to understand what an active voice and what a passive voice are.

Basically, a passive voice is when you emphasize the action rather than who or what is performing the action. An active voice is when you structure your sentence so that the subject performs the verb.

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In an active voice, the sentence becomes:
The vet was seeing the dog.