In this module, you will study voice, an important grammatical system that determines how the relationship between the subject, verb, and object is expressed in a sentence.
English sentences can be written in two main voices:
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Active voice
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Passive voice
In the active voice, the subject performs the action.
Example:
The researcher analysed the data.
In the passive voice, the focus shifts to the receiver of the action, rather than the doer.
Example:
The data were analysed by the researcher.
Passive voice is widely used in academic writing, scientific reports, formal communication, and objective descriptions, where the emphasis is often placed on the action or result rather than the person performing it.
Key Concepts in This Module
This module explores the full system of active and passive voice, including:
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the structural difference between active and passive sentences
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how subjects and objects change position during transformation
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how passive constructions are formed in different verb tenses
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how passive voice interacts with modal verbs and perfect forms
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when passive voice is appropriate in academic and formal writing
You will also learn to recognise and correct common passive voice errors.
Basic Structure of Active and Passive Voice
The transformation from active to passive voice involves a reorganisation of sentence elements.
Active Voice Structure
Subject + Verb + Object
Example:
The technician repaired the equipment.
| Element | Role |
|---|---|
| technician | subject (doer of action) |
| repaired | verb |
| equipment | object (receiver of action) |
Passive Voice Structure
Object + form of “be” + past participle (+ by + subject)
Example:
The equipment was repaired by the technician.
| Element | Role |
|---|---|
| equipment | subject of passive sentence |
| was repaired | passive verb |
| by the technician | agent |
The original object becomes the new subject, and the verb changes to be + past participle.
Why Passive Voice Is Used
Passive voice is useful when:
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the doer of the action is unknown
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the doer is not important
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the focus should be on the action or result
Example:
The experiment was conducted in a controlled environment.
Here, the emphasis is on the experiment, not the researcher.
Passive voice is therefore common in scientific writing and formal reports.
Active vs Passive Focus
| Voice | Example | Focus |
|---|---|---|
| Active | The researcher analysed the samples. | the researcher |
| Passive | The samples were analysed by the researcher. | the samples |
The choice between active and passive voice depends on what the writer wants to emphasise.
Lessons in This Module
| Lesson | Topic |
|---|---|
| Lesson 1️⃣ | Introduction to Active and Passive Voice |
| Lesson 2️⃣ | Passive Voice in Present and Past Tenses |
| Lesson 3️⃣ | Passive Voice in Perfect and Continuous Forms |
| Lesson 4️⃣ | Passive Voice with Modal Verbs |
| Lesson 5️⃣ | Agent and Agentless Passives |
| Lesson 6️⃣ | When to Use Passive Voice |
| Lesson 7️⃣ | Common Passive Voice Errors |
Skills You Will Develop
By the end of this module, you will be able to:
✅ distinguish between active and passive sentences
✅ transform active sentences into passive constructions
✅ form passive structures in different tenses and modal forms
✅ identify when passive voice is appropriate in academic writing
✅ recognise and correct common passive voice errors