Question

Change into passive:

The government has carried out many useful projects.
Before she did her homework, she had helped her mom.
The company prepared a new program for the workers .
Many students do extra work after leaving school.

Answer 1

Many useful projects have been carried out by the government.
Before her homework was done, she had helped her mom.
A new program for the workers was prepared by the company.
Extra work is done by many students after leaving school.