Active vs. Passive Voice: Differences, Rules, and When to Use Each

What Is Voice in Grammar?

Voice describes the relationship between a verb and its subject. It tells us whether the subject of a sentence is doing the action or receiving it. English has two voices: active and passive. Every sentence you write uses one or the other, and the choice between them shapes how readers experience your ideas.

This distinction matters more than most people realize. A sentence in active voice feels direct and punchy. The same idea expressed in passive voice can sound formal, detached, or evasive, depending on context. Neither voice is inherently "correct" — they serve different purposes, and good writers switch between them deliberately. For a broader look at how voice functions across different types of writing, see our guide to voice in writing.

What Is Active Voice?

In active voice, the subject performs the action expressed by the verb. The structure follows a straightforward pattern: Subject → Verb → Object.

Think of it this way: the subject is the "doer." It acts. It initiates. The sentence moves forward with the subject leading the charge.

Active Voice Examples

Notice how clean these sentences are. You immediately know who did what. There is no ambiguity. The reader never has to work backward to figure out the actor. That clarity is why most writing guides recommend active voice as the default — it keeps your prose tight and energetic. Pairing active voice with strong action verbs makes sentences even more vivid.

What Is Passive Voice?

In passive voice, the subject receives the action instead of performing it. The structure flips: Object (promoted to subject) → "be" verb + past participle → optional "by" phrase.

The doer either gets tucked into a "by" phrase at the end of the sentence or disappears entirely. That disappearing act is actually one of the most useful — and most abused — features of passive voice.

Passive Voice Examples

Each of these sentences conveys the same core meaning as its active counterpart. But the emphasis has shifted. The vase, the project, the barn — the things acted upon — now take center stage. The doer moves to the background, or in many passive sentences, vanishes completely ("The vase was knocked over" with no mention of the cat).

The Formula for Passive Voice

Passive voice always requires two elements:

1. A form of the verb "to be" (is, am, are, was, were, been, being)
2. A past participle (typically a verb ending in -ed, -en, or an irregular form like written, caught, sold)

If a sentence has a form of "to be" but no past participle, it is not passive. "She was running" is active — "was" is a helping verb forming the past continuous tense, and "running" is a present participle, not a past participle. "She was seen" is passive — "was" plus "seen" (past participle) fits the formula.

How to Identify Active and Passive Voice

Here is a reliable three-step test you can apply to any sentence:

1. Find the main verb. What action is being described?
2. Find the subject. Who or what is the sentence about?
3. Ask: Is the subject doing the action or receiving it?. If doing, the sentence is active. If receiving, it is passive.

You can also use a quick mechanical check: look for a form of "to be" directly followed by a past participle. If you see "was delivered," "is being reviewed," "has been eaten," or "will be announced," you are almost certainly looking at passive voice.

Tricky Cases That Are NOT Passive

Students often confuse passive voice with other constructions. These are not passive:

• "The door is open." — "Open" here is an adjective, not a past participle used as a verb. No action is happening.
• "She was sleeping." — Past continuous tense. "Sleeping" is a present participle. The subject is the doer.
• "They have arrived." — Present perfect tense with an intransitive verb. "Arrived" has no object, so there is nothing to passivize.
• "He is interested in science." — "Interested" functions as an adjective describing a state, not a verbal action being performed on the subject.

If you are ever unsure, try inserting "by someone" or "by something" after the verb. If the sentence still makes grammatical sense, it is probably passive. "The report was written [by someone]" works. "She was sleeping [by someone]" does not.

When to Use Active Voice

Active voice should be your default. Most writing — business emails, blog posts, essays, journalism, fiction, marketing copy — benefits from active constructions. Here is why:

1. Clarity

Active sentences answer "who did what" immediately. Readers process them faster because the information arrives in the natural order of action: actor first, action second, result third.

Passive: The quarterly report was reviewed by the finance team, and several errors were identified.
Active: The finance team reviewed the quarterly report and identified several errors.

The active version is shorter by three words and easier to parse.

2. Directness and Accountability

Active voice names the responsible party. This matters in professional and academic writing where you want to assign credit or responsibility clearly.

Passive: Mistakes were made.
Active: The marketing department made mistakes.

Politicians love "mistakes were made" precisely because it hides the doer. If your goal is honest, transparent communication, active voice keeps you accountable.

3. Stronger Narrative Energy

Fiction and creative nonfiction rely on active voice to create momentum. Passive constructions slow the pace and distance the reader from the action.

Passive: The sword was drawn by the knight, and the dragon was charged at.
Active: The knight drew his sword and charged the dragon.

4. Conciseness

Active sentences are almost always shorter. Passive voice requires extra words — a form of "to be" and often a "by" phrase. Over the course of a document, these extra words add up, bloating your prose without adding meaning.

When to Use Passive Voice

Passive voice is not a mistake. It is a tool, and there are situations where it is the better choice. Good writers recognize these situations and deploy passive voice intentionally.

1. When the Doer Is Unknown or Irrelevant

Sometimes you genuinely do not know who performed the action, or it does not matter.

"The window was broken sometime during the night."
"My bike was stolen."

Forcing active voice here ("Someone broke the window during the night") adds a vague subject that contributes nothing.

2. When the Action or Result Matters More Than the Actor

Scientific and technical writing frequently uses passive voice because the process or finding is more important than who performed it.

"The solution was heated to 100°C and was stirred for 30 minutes."
"The data were collected over a six-month period."

In lab reports, the researcher is assumed. Naming them in every sentence would be distracting and egocentric. The passive voice keeps the focus on the experiment.

3. When You Want to Emphasize the Receiver

Passive voice lets you put the important noun first, which can improve the flow of a paragraph.

"The Mona Lisa was painted by Leonardo da Vinci in the early 16th century."

If you are writing about the Mona Lisa (not about Leonardo), this sentence correctly keeps the painting in the spotlight.

4. For Diplomacy or Tact

Sometimes softening the blow matters. Passive voice can depersonalize a criticism.

Active (blunt): You broke the server.
Passive (tactful): The server was taken down unexpectedly.

In workplace communication, the passive version avoids pointing a finger while still addressing the issue.

5. Legal, Regulatory, and Formal Contexts

Contracts, laws, policies, and official notices often use passive voice by convention.

"Applicants will be notified within 30 business days."
"Trespassers will be prosecuted."

How to Convert Between Active and Passive Voice

Converting between voices is a mechanical process once you understand the parts of a sentence.

Active to Passive

1. Identify the subject, verb, and object in the active sentence.
2. Move the object to the subject position.
3. Change the verb to a form of "to be" + past participle.
4. Optionally, add the original subject in a "by" phrase.

Passive to Active

1. Find the doer (look for the "by" phrase, or infer who is performing the action).
2. Make the doer the new subject.
3. Remove the form of "to be" and use the main verb in the appropriate tense.
4. Place the old subject (the receiver) in the object position.

When there is no "by" phrase, you will need to supply a subject. Sometimes this is easy ("someone," "researchers," "the team"), but other times the missing doer is precisely the point of using passive voice. If naming the doer feels forced, the passive version may be the better choice. You can use our passive voice checker to quickly spot passive constructions in your drafts and decide which ones to convert.

Passive Voice Across Verb Tenses

Passive voice works in every tense. The form of "to be" changes to match the tense, while the past participle stays the same.

As you move into the perfect and continuous tenses, passive constructions get wordy fast. "The report will have been being written" is technically possible (future perfect continuous passive) but practically unusable. If a passive sentence sounds clumsy, that is usually a sign to switch to active voice.

Common Mistakes and Misconceptions

Mistake 1: Thinking Passive Voice Is Always Wrong

This is the biggest misconception. Writing guides, grammar checkers, and teachers often flag passive voice as an error. It is not. Passive voice is a grammatically correct construction with legitimate uses. The problem is overuse or misuse — using it when active voice would be clearer, or using it to dodge responsibility.

Mistake 2: Confusing Passive Voice with Past Tense

Voice and tense are independent concepts. A sentence can be active and past tense ("She wrote the letter"), passive and present tense ("The letter is written by her"), or any other combination. The presence of "was" does not automatically make a sentence passive.

Mistake 3: Confusing Passive Voice with Weak Writing

Not every dull sentence is passive, and not every passive sentence is dull. "The city was devastated by the earthquake" is passive but vivid. "Things happened and stuff occurred" is active but terrible. Weak writing comes from vague nouns, limp verbs, and unclear thinking — not from any particular grammatical voice.

Mistake 4: Adding a "by" Phrase That Restates the Obvious

One common error is converting to passive and keeping the doer even when it adds no information.

Awkward: "The surgery was performed by the surgeon."
Better: "The surgery was performed successfully."

If the doer is self-evident, drop the "by" phrase.

Mistake 5: Mixing Voices Mid-Sentence

Switching voice within a single sentence creates a jarring, unbalanced structure.

Inconsistent: "The team designed the interface, and the database was built by the developers."
Consistent (active): "The team designed the interface, and the developers built the database."

Maintain parallel structure within sentences. Between sentences and paragraphs, you have more freedom to switch voices as the content demands.

Active vs. Passive Voice: Quick Reference

Practical Tips for Balancing Active and Passive Voice

• Default to active. Start every sentence in active voice. Only switch to passive when you have a specific reason.
• Read your work aloud. Passive-heavy writing sounds stiff and bureaucratic. If a paragraph feels sluggish, look for passive constructions you can flip.
• Use passive voice to control emphasis. When the object of the action is more important than the subject, passive voice puts it where readers look first — the beginning of the sentence.
• Watch for "by" phrases. If you find yourself writing "by" after a verb phrase, ask whether the sentence would be stronger in active voice with the doer as the subject.
• Do not rewrite every passive sentence. Overcorrecting creates awkward constructions. Some sentences are genuinely better in passive voice.
• Use tools to audit your writing. Run your draft through a grammar checker to catch patterns you might miss on your own, then make deliberate choices about each flagged instance.

Frequently Asked Questions

What is the easiest way to tell if a sentence is passive?

Look for a form of "to be" (is, was, were, been, being) followed immediately by a past participle (usually a word ending in -ed or -en, like "written," "broken," or "delivered"). If both are present and the subject is receiving the action rather than performing it, the sentence is passive. You can also try the "by zombies" trick: if you can add "by zombies" after the verb and the sentence still makes grammatical sense ("The report was written by zombies"), it is passive.

Is passive voice grammatically incorrect?

No. Passive voice is a perfectly valid grammatical construction in English. It is not an error, a sign of bad writing, or something to avoid at all costs. The issue is overuse. When passive voice dominates a text, the writing tends to feel indirect and hard to follow. But used purposefully — to emphasize the action, hide an unknown actor, or maintain a formal tone — passive voice is the right tool for the job.

Why do scientific papers use so much passive voice?

Scientific writing traditionally uses passive voice to emphasize the method and results rather than the researcher. "The samples were tested" keeps the focus on the experiment, not on who ran it. This convention promotes objectivity and suggests that the results are reproducible regardless of who performs the procedure. That said, many modern style guides (including the APA manual) now encourage active voice in scientific writing where it improves clarity.

Can a sentence with "was" be in active voice?

Yes. "Was" by itself does not create passive voice. "She was running" is active (past continuous tense). "The movie was long" is active (linking verb with adjective). Passive voice specifically requires "was" (or another form of "to be") plus a past participle functioning as the main verb, with the subject receiving the action: "The movie was directed by Spielberg."

How much passive voice is too much?

There is no hard rule, but a useful benchmark is to keep passive constructions below 10-15% of your sentences in most writing contexts. If every other sentence uses passive voice, your prose will feel flat and evasive. Run your text through a passive voice checker to see your ratio, then evaluate each instance individually. Some will be doing useful work; others will just be adding unnecessary weight.

Does changing voice change the meaning of a sentence?

The core factual meaning stays the same: "The dog bit the man" and "The man was bitten by the dog" describe the same event. But the emphasis shifts. Active voice highlights the doer (the dog). Passive voice highlights the receiver (the man). In context, this shift matters. If the next sentence is about the man's injury, passive voice creates a smoother transition. If the next sentence is about the dog's behavior, active voice flows better. Meaning is about more than facts — it is about what you draw the reader's attention to.