1. Lesson Overview
In this lesson, you will learn:
- The difference between active and passive
- Basic transformation steps
- Role of subject and object
- Structure formula
- Agreement rules
2 What Is Active Voice?
Active voice:
Subject performs the action.
Structure:
Subject + verb + object
Example:
Scientists discovered penicillin.
Subject = Scientists
Verb = discovered
Object = penicillin
3. What Is Passive Voice?
Passive voice:
Object becomes the focus.
Structure:
Object + be + past participle (+ by + subject)
Example:
Penicillin was discovered by scientists.
4. Step-by-Step Transformation
Active:
The committee approved the proposal.
Step 1: Identify object → the proposal
Step 2: Move the object to the subject position
Step 3: Add the correct “be” verb
Step 4: Add past participle
Passive:
The proposal was approved by the committee.
5. Passive Formula
Object + correct form of be + V3 (+ by + subject)
The be verb changes according to tense.
6. Passive in Present Simple
Active:
Researchers analyze data.
Passive:
Data are analyzed.
Singular:
The scientist analyzes data.
Data is analyzed by the scientist.
7. Passive in Past Simple
Active:
Alexander Fleming discovered penicillin.
Passive:
Penicillin was discovered by Alexander Fleming.
8. When “By” Is Omitted
If the doer is unknown or unimportant:
The experiment was conducted last year.
“By scientists” is not necessary.
Common in academic writing.
9. Common Errors
⚠ Forgetting “be.”
Incorrect:
The proposal approved.
Correct:
The proposal was approved.
⚠ Wrong verb form
Incorrect:
The proposal was approve.
Correct:
The proposal was approved.
⚠ Keeping the object in place
Incorrect:
The committee was approved the proposal.
Correct:
The proposal was approved by the committee.
10. End of Lesson Check
You should now be able to:
✅Identify active sentences
✅Identify objects
✅Transform into passive
✅Apply the correct “be” form
✅Avoid structural mistakes