Question

1. The thief has been caught by the policeman. change the sentence singular into the plural

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Answer 1

First guy said it perfectly

The correct way to say this in ~plural~ form would be
The thieves have been caught by the policemen.
Thief would be changed to Thieves (f changes to v, then add es)
Has would be changed to have (can’t explain why it just for sure sounds better)
Policeman would be changed to Policemen (more than one)

Answer 2

The thieves have been caught by the policemen.

Step-by-step explanation:

The thieves, multiple individuals engaged in illegal activities, have been apprehended by the policemen, who are law enforcement officers responsible for maintaining public safety and enforcing the law.

I hope this helped!

~~~Harsha~~~