1. Lesson Overview
In this lesson, you will learn how passive voice is formed in present and past tenses. Since passive voice depends on the auxiliary verb “be”, the tense of the sentence changes according to the tense of this auxiliary verb.
Understanding how passive voice works across different tenses helps learners correctly transform sentences between active and passive structures.
In this lesson, you will learn how to form passive sentences in:
-
present simple
-
present continuous
-
past simple
-
past continuous
By the end of this lesson, you will be able to:
-
form passive sentences in present and past tenses
-
recognise how tense affects the auxiliary verb “be”
-
transform active sentences into passive ones correctly
-
avoid common mistakes when forming passive structures
2. Concept Introduction
Consider the following sentences:
Active:
The technician repairs the system.
Passive:
The system is repaired by the technician.
Now compare another example:
Active:
The technician repaired the system yesterday.
Passive:
The system was repaired by the technician yesterday.
| Active Sentence | Passive Sentence |
|---|---|
| repairs | is repaired |
| repaired | was repaired |
The tense of the sentence is preserved by changing the form of “be.”
3. Core Explanation
The passive voice is formed using:
be + past participle
The tense of the passive sentence is determined by the form of “be.”
Example:
Active:
The researcher analyses the data.
Passive:
The data are analysed by the researcher.
Here the verb are indicates the present tense.
Example:
Active:
The researcher analysed the data.
Passive:
The data were analysed by the researcher.
Here were indicates the past tense.
4. Rule Table
Present Simple Passive
| Structure | Example |
|---|---|
| subject + am / is / are + past participle | The samples are analysed in the laboratory. |
Example:
Active:
Researchers analyse the samples.
Passive:
The samples are analysed by researchers.
Present Continuous Passive
| Structure | Example |
|---|---|
| subject + am / is / are + being + past participle | The experiment is being conducted today. |
Example:
Active:
The team is conducting the experiment.
Passive:
The experiment is being conducted by the team.
Past Simple Passive
| Structure | Example |
|---|---|
| subject + was / were + past participle | The report was written yesterday. |
Example:
Active:
The researcher wrote the report.
Passive:
The report was written by the researcher.
Past Continuous Passive
| Structure | Example |
|---|---|
| subject + was / were + being + past participle | The samples were being analysed during the test. |
Example:
Active:
The scientists were analysing the samples.
Passive:
The samples were being analysed by the scientists.
5. Usage
1. Describing general processes
Example:
The samples are analysed using specialised equipment.
2. Reporting completed actions
Example:
The report was published last year.
3. Describing ongoing actions
Example:
The system is being tested today.
4. Describing actions in progress in the past
Example:
The data were being analysed when the computer failed.
5. Emphasising results rather than performers
Example:
The experiment was completed successfully.
6. Signal Words
Certain time expressions help indicate the tense used in passive sentences.
| Expression | Example |
|---|---|
| usually | The samples are usually analysed in the laboratory. |
| every day | The equipment is inspected every day. |
| yesterday | The report was written yesterday. |
| last year | The system was developed last year. |
| at the moment | The device is being tested at the moment. |
| during the experiment | The samples were being analysed during the experiment. |
These expressions help identify when the action occurred.
7. Special Cases
Passive Voice Without an Agent
The agent is often omitted when it is unknown or unnecessary.
Example:
The report was published last month.
The performer is not important.
Agreement with the New Subject
In passive sentences, the verb must agree with the new subject.
Example:
Active:
The researcher analysed the samples.
Passive:
The samples were analysed by the researcher.
The verb agrees with samples, not researcher.
8. Additional Notes
Passive voice is especially common in scientific and technical writing, where the emphasis is placed on procedures, processes, and results.
Example:
The samples were stored at a controlled temperature.
This style keeps the focus on the method rather than the person performing it.
9. Common Errors
⚠ Incorrect auxiliary verb
Incorrect:
The samples analysed in the laboratory.
Correct:
The samples are analysed in the laboratory.
Explanation:
Passive voice requires be + past participle.
⚠ Incorrect tense
Incorrect:
The report is written yesterday.
Correct:
The report was written yesterday.
Explanation:
Past time expressions require past tense.
⚠ Incorrect participle form
Incorrect:
The system was repair by the technician.
Correct:
The system was repaired by the technician.
Explanation:
Passive voice requires the past participle.
⚠ Missing “being” in continuous passive
Incorrect:
The experiment is conducted now.
Correct:
The experiment is being conducted now.
Explanation:
Continuous passive requires being.
⚠ Subject–verb disagreement
Incorrect:
The samples was analysed.
Correct:
The samples were analysed.
Explanation:
The auxiliary verb must agree with the subject.
10. Lesson Mastery
After completing this lesson, you should now be able to:
✅ form passive sentences in present and past tenses
✅ recognise how tense affects passive verb structure
✅ transform active sentences into passive sentences correctly
✅ avoid common mistakes in passive tense formation