Transformation and Synthesis

Lesson 1: Active to Passive and Passive to Active

Lesson: 1 of 7 | Level: 🟠 Intermediate

1. Lesson Overview

The transformation between active and passive voice is one of the most frequently required and most practically important transformation skills in English. It appears in examination tasks, in academic editing, in the revision of formal documents, and in the everyday work of any writer who needs to control perspective, emphasis, and tone. Performing it accurately requires not only knowing the passive formation rules established in Module 6 but applying them systematically across all tenses, with modal verbs, with reporting verbs, and in the context of sentences with two objects.

This lesson examines every dimension of active-to-passive and passive-to-active transformation — working through every tense, every modal construction, every special case, and the full set of checking procedures that ensure the transformation is accurate and complete.

Objectives

By the end of this lesson, you will be able to:

• Transform active sentences into passive sentences across all tenses
• Transform passive sentences into active sentences across all tenses
• Handle special cases — two objects, modal passives, and reporting verb passives
• Apply all required changes simultaneously — tense, word order, agent, preposition
• Check transformations systematically for accuracy and completeness

2. Core Content

A. The Active-to-Passive Transformation — The Complete Procedure

Every active-to-passive transformation follows a fixed five-step procedure. Applying this procedure systematically — rather than attempting the transformation intuitively — produces consistently accurate results.

Step 1 — Identify the direct object

The direct object of the active sentence becomes the subject of the passive sentence.

Step 2 — Identify the subject (agent)

The subject of the active sentence becomes the by-phrase of the passive sentence — or is omitted if it is unimportant, obvious, or unknown.

Step 3 — Change the verb to passive form

The active verb is replaced by the appropriate tense of be + past participle.

Step 4 — Check all other elements

Adverbials, time expressions, indirect objects, and other sentence elements remain in their correct positions.

Step 5 — Check the result

Read the transformed sentence and verify that it conveys the same essential meaning as the original.

B. Active to Passive — All Tenses

Simple present

Active: Scientists discover new species every year. Passive: New species are discovered every year.

Active: The team analyses the data at the central laboratory. Passive: The data is analysed at the central laboratory.

Present continuous

Active: Scientists are mapping the ocean floor. Passive: The ocean floor is being mapped by scientists.

Active: The team is collecting samples from twelve sites. Passive: Samples are being collected from twelve sites.

Present perfect

Active: Scientists have identified more than five thousand species. Passive: More than five thousand species have been identified.

Active: The team has submitted the report. Passive: The report has been submitted.

Simple past

Active: Scientists discovered hydrothermal vents in 1977. Passive: Hydrothermal vents were discovered in 1977.

Active: Darwin proposed the theory of natural selection in 1859. Passive: The theory of natural selection was proposed by Darwin in 1859.

Past continuous

Active: The team was collecting data when the storm struck. Passive: Data was being collected when the storm struck.

Past perfect

Active: Scientists had established baseline measurements before the operations began. Passive: Baseline measurements had been established before the operations began.

Simple future — will

Active: The team will publish the findings next month. Passive: The findings will be published next month.

Active: Scientists will conduct a comprehensive survey of the vent field. Passive: A comprehensive survey of the vent field will be conducted.

Future perfect

Active: Scientists will have mapped the entire vent field by 2030. Passive: The entire vent field will have been mapped by 2030.

Going to

Active: The team is going to deploy autonomous vehicles next week. Passive: Autonomous vehicles are going to be deployed next week.

C. Active to Passive — Modal Verbs

Modal passives follow the pattern modal + be + past participle for present/future, and modal + have been + past participle for past.

Present/future modal passives

Active: Scientists must establish baseline measurements before operations begin. Passive: Baseline measurements must be established before operations begin.

Active: The team should submit the data within thirty days. Passive: The data should be submitted within thirty days.

Active: Researchers can access the archived data. Passive: The archived data can be accessed.

Active: The committee may extend the deadline. Passive: The deadline may be extended.

Active: Scientists ought to conduct a full environmental assessment. Passive: A full environmental assessment ought to be conducted.

Past modal passives

Active: The team should have established baseline measurements. Passive: Baseline measurements should have been established.

Active: Scientists could have detected the anomaly earlier. Passive: The anomaly could have been detected earlier.

Active: The committee must have approved the proposal. Passive: The proposal must have been approved.

D. Active to Passive — Sentences with Two Objects

When an active sentence has both a direct object and an indirect object, either can become the subject of the passive sentence. The choice determines what is foregrounded.

For example:

Active: The funding body awarded the team a significant grant.

Option 1 — indirect object as passive subject (preferred when referring to a person)

Passive: The team was awarded a significant grant by the funding body.

Option 2 — direct object as passive subject

Passive: A significant grant was awarded to the team by the funding body.

Note that when the direct object becomes the passive subject, the indirect object is retained with its preposition (to).

Further examples:

Active: The committee gave the researchers full access to the archive. Passive (IO as subject): The researchers were given full access to the archive. Passive (DO as subject): Full access to the archive was given to the researchers.

Active: The institute offered the team additional funding. Passive (IO as subject): The team was offered additional funding. Passive (DO as subject): Additional funding was offered to the team.

E. The Passive-to-Active Transformation — The Complete Procedure

Transforming passive to active follows the same logic in reverse — but requires careful attention to recovering the agent from the by-phrase (or inferring it from context) and adjusting the verb form accordingly.

Step 1 — Identify the passive subject (patient)

The subject of the passive sentence becomes the direct object of the active sentence.

Step 2 — Identify the agent

The by-phrase of the passive sentence becomes the subject of the active sentence. If there is no by-phrase, an appropriate agent must be supplied — scientists, researchers, the team, people, someone, or a pronoun.

Step 3 — Change the verb to active form

The passive verb (be + past participle) is replaced by the appropriate active form.

Step 4 — Check all other elements

Step 5 — Check the result

F. Passive to Active — Examples Across Tenses

Passive: New species are discovered every year. Active: Scientists discover new species every year.

Passive: The ocean floor is being mapped. Active: Scientists are mapping the ocean floor.

Passive: The theory was proposed by Darwin in 1859. Active: Darwin proposed the theory in 1859.

Passive: Baseline measurements had been established before operations began. Active: Scientists had established baseline measurements before operations began.

Passive: The findings will be published next month. Active: The team will publish the findings next month.

Passive: The data must be submitted within thirty days. Active: Researchers must submit the data within thirty days.

Passive: Baseline measurements should have been established earlier. Active: Scientists should have established baseline measurements earlier.

G. Special Cases and Challenges

When there is no by-phrase

Many passive sentences have no by-phrase — the agent is unknown, obvious, or unimportant. When transforming these to active, an appropriate agent subject must be supplied.

Passive: The samples were collected from twelve sites. Active: Scientists/The team collected the samples from twelve sites.

Passive: The findings have been published. Active: The research team/Researchers have published the findings.

Intransitive verbs — cannot be passivised

Not all active sentences can be transformed to passive — only transitive verbs (those taking a direct object) can be made passive. Intransitive verbs have no direct object and therefore no passive form.

The glacier retreats every summer. ❌ → cannot be made passive (retreat is intransitive here) Scientists arrived at the site in January. ❌ → cannot be made passive (arrive is intransitive)

Stative verbs — typically not passivised

Stative verbs — have, contain, belong, resemble, consist — typically cannot be made passive in the standard way.

The ocean contains many species. ❌ → Many species are contained by the ocean. (unnatural) The solution consists of three elements. ❌ → not passivised

Causative have and get

Have and get in causative constructions produce a different kind of passive meaning — the subject arranges for something to be done by someone else.

Active causative: The team had the instruments calibrated before the dive. Get causative: The team got the instruments calibrated before the dive.

These are not standard active-to-passive transformations — they are causative constructions and should be treated as a separate structure.

3. Usage in Context

• Apply the five-step procedure systematically for every active-to-passive transformation — identify direct object, move subject to by-phrase, change verb form, check other elements, verify the result.

Active: Darwin proposed the theory of natural selection in 1859 after more than twenty years of careful preparation. Passive: The theory of natural selection was proposed by Darwin in 1859 after more than twenty years of careful preparation.

• When the agent is unimportant or obvious, omit the by-phrase in the passive version.

Active: Scientists have identified more than five thousand species in vent ecosystems since 1977. Passive: More than five thousand species have been identified in vent ecosystems since 1977. (agent omitted — obvious)

• Apply modal passives correctly — modal + be + past participle for present/future; modal + have been + past participle for past.

Active: The team must submit all data within thirty days of collection. Passive: All data must be submitted within thirty days of collection.

Active: Scientists should have established baseline measurements before operations began. Passive: Baseline measurements should have been established before operations began.

• For sentences with two objects, prefer the indirect object (person) as passive subject — it is more natural.

Active: The funding body awarded the team a significant grant for the second phase. Passive: The team was awarded a significant grant for the second phase by the funding body. (preferred) Passive: A significant grant was awarded to the team for the second phase. (also correct)

• When transforming passive to active with no by-phrase, supply an appropriate agent.

Passive: The vent field was first observed in 1977. Active: Scientists first observed the vent field in 1977.

• Check that the tense of be in the passive matches the tense of the original active verb exactly.

Active: The team is collecting samples. (present continuous active) Passive: Samples are being collected. (present continuous passive — not are collected)

• Check that intransitive verbs and stative verbs are not incorrectly passivised.

The glacier retreats every summer. → Cannot be made passive. ✅ The ocean contains many species. → Cannot be naturally passivised. ✅

4. Common Errors and Corrections

5. Lesson Mastery

After completing this lesson, you should now be able to:

    ✅ Transform active sentences into passive sentences across all tenses

    ✅ Transform passive sentences into active sentences across all tenses

    ✅ Handle special cases — two objects, modal passives, and reporting verb passives

    ✅ Apply all required changes simultaneously — tense, word order, agent, preposition

    ✅ Check transformations systematically for accuracy and completeness