Select the correct passive form of the given sentence.
A child could understand his theory.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. His theory could be understood by a child.
Active voice- Subject + could + v1 + object + other words.
Passive voice - Object + could be+ v3 + by + subject + other words.
As the chosen option follows this structure it will be correct.