Question

The Shepherd finds his lost sheep ( change voice)

Answer 1

Answer:

1/ His lost sheep is found by the Shepherd.

2/ His lost sheep are found by the Shepherd.

Explanation: Here , in your sentence ( Sheep ) is singular or plural form, whatever you can use ( Is / Are ) . The word ( Sheep ) carries singular & plural form together. So you can write both of these sentences. The verb ( Find s ) is in simple Present form so change it into Past Participle from ( Found )