Active & Passive Voice

Active & Passive Voice

🟢 Lite

Key Pattern/Rule

Active voice = subject does the action. Passive voice = subject receives the action. Conversion: object becomes subject, verb becomes “be + past participle.”

Memory Trick

Ask: “Who/what is doing the action?” That’s the subject in active voice and becomes the object (with “by”) in passive.

1-Sentence Summary

GATE tests whether you can spot passive constructions and correctly convert between active and passive voice while maintaining subject-verb agreement.

Quick Example

Q: Choose the passive form of “The chef prepared the meal.” (A) The meal was prepared by the chef (B) The meal is preparing by the chef (C) The chef was preparing the meal (D) The meal prepared the chef A: (A) The meal was prepared by the chef — the meal (object) becomes subject, verb changes to “was prepared” (be + past participle).

🟡 Standard

Concept

Voice describes whether the subject of a sentence is performing the action or receiving it. In active voice, the subject acts upon the object: “The engineer solved the problem.” In passive voice, the object becomes the subject and receives the action: “The problem was solved by the engineer.” Both are grammatically correct; the choice depends on what you want to emphasize.

GATE focuses on passive voice in engineering and scientific contexts where objectivity matters. “The sample was heated to 100°C” sounds more scientific than “We heated the sample to 100°C” because it emphasizes the experiment over the experimenter. This stylistic preference for passive in technical writing is why you’ll encounter it frequently in GATE’s reading comprehension passages — and why you need to master both spotting and constructing passive sentences.

The mechanics are straightforward: passive voice requires the verb “be” (in whatever tense matches the original) plus the past participle of the main verb. “Is written,” “was completed,” “will be announced,” “has been studied.” Without the “be” helper, you just have a regular verb form. And without the past participle, you’re not forming a passive.

Types & Approach

Identifying Passive: Look for “be + past participle” — if you find it and the subject isn’t doing the action, it’s passive. Watch out for participles used as adjectives (“the broken window”) — no “by” phrase and no agent receiver.

Converting Active to Passive:

1. Identify the object (becomes new subject)
2. Change the verb to appropriate form of “be” + past participle
3. Original subject becomes object with “by”
4. Preserve the tense of the original verb

Converting Passive to Active:

1. Identify the “by + agent” phrase (becomes new subject)
2. Change the “be + past participle” to active verb form matching original tense
3. Original subject (now object) drops “by”

Approach: First, find the verb phrase. If it’s “be + past participle,” you’re dealing with passive. Second, identify who/what is doing the action (agent). Third, restructure according to the rules.

Step-by-Step Example

Q: Convert to passive: “The team will complete the project on time.” A: The project will be completed by the team on time.

Approach: Step 1 → Object = “the project” → new subject Step 2 → Verb “will complete” → “will be completed” (be + past participle, same tense) Step 3 → Subject “the team” → “by the team” Answer: The project will be completed by the team on time.

Common Mistakes

• Using past participle without “be” → “The project completed” is active (intransitive) or broken grammar, not passive
• Forgetting subject-verb agreement in passive → “The data was analyzed” (singular) vs. “The data were analyzed” (plural) — match the original number
• Leaving out the “by agent” when required → Passive sentences need the doer expressed or at least implied (“The car was repaired” — implies someone did it)
• Mixing up linking verbs with passive → “He is tired” is linking verb + adjective, not passive

🔴 Extended

Full Concept Explanation

Voice is a grammatical category that determines the relationship between the action expressed by the verb and the participants it involves. Understanding voice deeply means recognizing that it’s not just a mechanical transformation rule — it’s a rhetorical choice that shifts emphasis and perspective. In active voice, the subject is the agent, the doer of the action. In passive voice, the subject is the patient, the receiver of the action.

The transformation mechanics must be internalized to the point where they become automatic. Given any active sentence, you should be able to produce its passive counterpart without hesitation. The steps are: (1) swap subject and object, (2) add the appropriate form of “be” before the main verb, (3) convert the main verb to past participle, (4) introduce the original subject with “by” unless it should be omitted for style or clarity. This works consistently across tenses — the “be” verb conjugates while the main verb stays as past participle.

Tense matters critically in voice conversion. The tense of the active sentence determines which form of “be” appears in the passive. Present simple active “writes” becomes present simple passive “is written.” Past simple “wrote” becomes “was written.” Future simple “will write” becomes “will be written.” Present perfect “has written” becomes “has been written.” These patterns are consistent but require conscious memorization of the conjugation table.

Subject-verb agreement in passive sentences deserves special attention because it surprises many students. The verb “be” agrees with the new subject (the former object), not the original subject. “The boxes were moved by the truck” — “boxes” is plural, so “were” is correct, even though the agent “truck” is singular. This catches students who instinctively match the verb to the “by” phrase.

The decision to use passive voice in technical writing is deliberate. Passive emphasizes the action and its recipient over the actor — useful when the action matters more than who performed it. “The solution was heated to 80°C” focuses on what happened to the solution. “We heated the solution to 80°C” focuses on our action. In scientific method descriptions, passive is conventional because reproducibility matters more than who did the experiment. In engineering reports, this convention holds: “Stress limits were exceeded” rather than “The load exceeded stress limits.”

GATE-Level Practice

Q1: Identify the passive voice construction in the following: “The results of the experiment were analyzed by the researchers, and several anomalies were identified in the dataset.” (A) were analyzed (B) were identified (C) Both A and B (D) Neither

Working: Both “were analyzed” and “were identified” follow the passive pattern: be-verb (were) + past participle (analyzed/identified). The subjects “results” and “anomalies” receive the action rather than perform it. Answer: (C) Both A and B

Q2: Convert to active voice: “The bridge is being constructed by the workers.” (A) The workers are constructing the bridge (B) The bridge is constructing by the workers (C) The bridge was being constructed by the workers (D) The workers were constructing the bridge

Working: The passive “is being constructed” is present continuous passive. Removing “be” and using the original continuous form gives us “are constructing” (present continuous active). The object “bridge” moves to become the direct object. Answer: (A) The workers are constructing the bridge

Multiple Approaches

Mechanical Approach: Apply the conversion rules systematically — identify tense, select correct “be” form, ensure past participle, manage the “by” phrase.

Intuitive Reading Approach: For passive identification, trust your ear — passive constructions often feel indirect or wordy because the actor comes after the action. “The report must be submitted by Friday” — if you instinctively want to say “Someone must submit the report by Friday,” you’re recognizing the underlying active structure.

Tense Preservation Approach: Always match the passive verb’s tense to the active verb’s tense exactly. If the active uses past perfect, the passive uses past perfect. This matters for complex sentences.

Tricky Cases / Edge Cases

• Stative verbs vs. action verbs: Some verbs describe states, not actions, and don’t typically appear in passive. “She resembles her mother” → *“Her mother is resembled by her” is ungrammatical. Only action verbs work in passive.
• Double objects (indirect + direct): “Gave her a book” can become passive two ways: “She was given a book” (keeping indirect object as subject) or “A book was given to her” (keeping direct object as subject). Both are valid — GATE may test which form is preferred.
• Participial adjectives vs. true passive: “The broken vase” looks passive but is actually an adjective phrase — no “by” agent needed or implied. “The vase was broken by the child” is a true passive sentence with an agent.
• Implied agents: Passive sentences often omit the “by” phrase when the agent is obvious, unimportant, or generic. “Smoking is prohibited” — no one needs to say “by law” every time. Don’t assume the absence of “by” means it’s not passive.
• Modal verbs in passive: “Must be done,” “should be completed,” “can be achieved” — the modal stays before “be” and the past participle follows. “The project must be completed by Monday.”

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