Passive Voice "By" Agent Exercises
B1-B2 Level
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Practise deciding when a passive sentence needs a by-agent and how to form it.
Review the grammar firstAll 20 questions
Decide whether to include or omit the agent (by + person/thing). Include the agent only when it adds important information.
Someone stole my wallet. (My wallet...)
My wallet
Shakespeare wrote Romeo and Juliet. (Romeo and Juliet...)
Romeo and Juliet
They manufacture these cars in Germany. (These cars...)
These cars
The storm destroyed several buildings. (Several buildings...)
Several buildings
People speak English all over the world. (English...)
English
Alexander Graham Bell invented the telephone. (The telephone...)
The telephone
The police arrested the suspect. (The suspect...)
The suspect
A 10-year-old boy solved the complex equation. (The complex equation...)
The complex equation
The waiter served dinner at 8pm. (Dinner...)
Dinner
Picasso painted this masterpiece. (This masterpiece...)
This masterpiece
One should respect the rules. (The rules...)
The rules
The earthquake damaged hundreds of buildings. (Hundreds of buildings...)
Hundreds of buildings
A local company sponsors the event. (The event...)
The event
They clean the office every evening. (The office...)
The office
A falling tree killed the driver. (The driver...)
The driver
The government will change the law. (The law...)
The law
My grandmother made this sweater. (This sweater...)
This sweater
They publish the newspaper daily. (The newspaper...)
The newspaper
Our own team members leaked the confidential information. (The confidential information...)
The confidential information
Someone left a message for you. (A message...)
A message
Grammar review
For example, "This novel was written by George Orwell" — the author is important. "The window was broken by a falling tree" — the cause is surprising and relevant. Omit the agent when it is unknown ("My phone was stolen"), obvious ("The suspect was arrested" — clearly by the police), vague ("English is spoken worldwide" — saying "by people" adds nothing), or unimportant for the message. In practice, around 80% of passive sentences in English omit the agent. Learning when to include or omit "by" makes your passive sentences sound natural and is a skill tested in Cambridge B1 Preliminary and B2 First exams, especially in sentence transformation tasks.
Quick Rule
Subject + be + past participle + by + agent (when needed)
- 1.The Mona Lisa was painted by Leonardo da Vinci. (famous agent)
- 2.My wallet was stolen. (agent unknown — omitted)
- 3.It was designed by a local architect. (agent important)
- 4.English is spoken in over 50 countries. (agent unimportant — omitted)
- 5.The suspect wasn't identified by any witness. (negative with agent)
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