To learn English active and passive voice quickly and correctly, begin by deciding who or what the sentence should focus on. In active voice, the subject usually does the action: “The teacher checked the answers.” In passive voice, the subject receives the action: “The answers were checked by the teacher.” Both can be correct, but they organise information differently. These English Quick Notes teach you how to recognise, form and choose the passive accurately without changing the time or meaning of the sentence.
- Find the action: underline the main verb and identify the person or thing doing it.
- Find the object: identify what receives the action; this can usually become the passive subject.
- Keep the tense: use the appropriate form of be and a past participle.
- Add the doer only when useful: by the teacher is optional if the doer is unimportant or unknown.
- Choose a purpose: active voice often highlights responsibility; passive voice can highlight a result or process.
Teaching step 1 — draw a simple action arrow. Read “The girl opened the window.” The doer is the girl; the action is opened; the receiver is the window. Write the order as doer → action → receiver. Now change the starting point to the receiver: “The window was opened by the girl.” You are not inventing a new event. You are describing the same event with the receiver at the front.
Teaching step 2 — build the correct verb phrase. Passive voice generally uses a form of be plus the past participle. Present simple: “The windows are cleaned every Friday.” Past simple: “The windows were cleaned yesterday.” Present perfect: “The windows have been cleaned.” Do not choose is or was from memory alone. Check the subject, number and tense of the original sentence first.
Teaching step 3 — decide whether to name the doer. “The experiment was completed before lunch” is a useful passive sentence even without a by phrase. Perhaps the result matters more than who completed it. “The experiment was completed by the science club” is clearer when the group matters. In a report, avoid hiding the actor if readers need to know who is responsible. Choose voice to communicate the meaning, not just to display a grammar trick.
The difference between active and passive voice
- Active: “The librarian arranged the books.” Focus: the librarian as doer.
- Passive: “The books were arranged by the librarian.” Focus: the books as receivers of the action.
- Active: “Someone repaired the bridge.” We mention an unspecified doer.
- Passive: “The bridge was repaired.” Focus: the completed repair.
- Active: “The coach will announce the results.” Focus: the coach.
- Passive: “The results will be announced by the coach.” Focus: the results.
Notice that the passive subject is not necessarily doing the action. “The books were arranged” does not say the books arranged themselves. This is the most important meaning check when you convert a sentence.
A five-step method for changing active into passive
- Step 1: find the subject, verb and object: “The chef / prepared / the meal.”
- Step 2: move the object to the front: “The meal …”
- Step 3: identify the original tense: prepared is past simple.
- Step 4: choose the correct passive verb phrase: was prepared.
- Step 5: add the doer if useful: “The meal was prepared by the chef.”
Do the steps in this order. If you begin by adding was without checking the tense, you may change a present event into a past one. If you forget the past participle, you may write a non-standard form such as “The meal was prepare.” The method protects both grammar and meaning.
The passive verb patterns you need for school
- Present simple: “They collect the books.” → “The books are collected.”
- Past simple: “They collected the books.” → “The books were collected.”
- Future with will: “They will collect the books.” → “The books will be collected.”
- Present continuous: “They are collecting the books.” → “The books are being collected.”
- Past continuous: “They were collecting the books.” → “The books were being collected.”
- Present perfect: “They have collected the books.” → “The books have been collected.”
- Modal verb: “You must finish the task.” → “The task must be finished.”
The recurring idea is simple: keep the time and aspect, then use the passive participle. For longer forms such as “are being collected,” break the phrase into pieces: are carries present time and plural agreement; being shows the continuous passive; collected is the past participle. Say each piece slowly before trying a full conversion.
The past participle matters
For a regular verb, the past participle often ends in -ed: cleaned, checked, painted. But many common verbs are irregular: write → written, take → taken, make → made, eat → eaten, choose → chosen. “The letter was written” is correct; “The letter was wrote” is not standard. It helps to keep a small list of the irregular participles you actually use.
When the passive is a useful choice
When the result matters most
“The samples were labelled and stored carefully.” A scientific method often gives readers the procedure or result before the identity of the person who performed it. Passive voice can be natural in that setting, especially when the actor is obvious or irrelevant.
When the doer is unknown
“My bicycle was stolen last night.” The doer is not known. The sentence focuses on what happened to the bicycle. You should not invent “by someone” when it adds no useful information.
When the receiver is already the topic
“The old bridge has been repaired. It will reopen next week.” The bridge is the topic of both sentences, so passive voice provides a smooth connection. Switching suddenly to an unknown engineer could distract from the topic.
When the doer must be accountable
“The team submitted the report late” can be clearer than “The report was submitted late” if the reader needs to know who submitted it. Passive voice is not automatically more formal or better. It can make responsibility less visible, which is unhelpful when the doer matters.
Some sentences cannot be changed in the ordinary way
Consider “The baby slept.” The verb slept has no direct object. There is no receiving object to move to the subject position, so do not invent “The baby was slept” as a passive transformation. The same issue appears with many common intransitive uses, such as “The accident happened” and “She arrived.” An ordinary passive conversion needs a verb construction that can take a suitable object.
Passive questions and negatives
- Negative: “The instructions were not followed.” Place not after the first auxiliary.
- Question: “Were the instructions followed?” Move the auxiliary before the subject.
- Present-simple negative: “The machines are not switched on at night.”
- Modal question: “Can the answer be checked?” Keep be + past participle after the modal.
When checking questions, do not add a second passive be accidentally. “Was the window opened?” works. “Did the window was opened?” is incorrect because it mixes two different question patterns.
Five common mistakes and corrections
- Incorrect: “The door was open by the guard.” Correct for the action: “The door was opened by the guard.” Use the past participle opened.
- Incorrect: “The homework is mark by the tutor.” Correct: “The homework is marked by the tutor.”
- Incorrect: “The letters was posted.” Correct: “The letters were posted.” The auxiliary agrees with the plural subject.
- Incorrect: “The result will announced tomorrow.” Correct: “The result will be announced tomorrow.”
- Incorrect: “The accident was happened last night.” Correct: “The accident happened last night.” The ordinary intransitive verb does not take this passive form.
Quick practice: rewrite in passive voice
- 1. The pupil cleans the whiteboard every morning.
- 2. The teacher praised the team yesterday.
- 3. The librarian will return the books tomorrow.
- 4. The class is preparing the display.
- 5. The children have completed the activity.
- 6. The workers repaired the road last week.
- 7. They must submit the forms by Friday.
- 8. The judge chose the winner.
- 9. The school does not allow phones during this test.
- 10. The pupils were decorating the classroom.
Sample answers with tense checks
- 1. The whiteboard is cleaned every morning by the pupil. — present simple passive.
- 2. The team was praised by the teacher yesterday. — past simple passive.
- 3. The books will be returned by the librarian tomorrow. — future passive.
- 4. The display is being prepared by the class. — present continuous passive.
- 5. The activity has been completed by the children. — present perfect passive.
- 6. The road was repaired by the workers last week. — past simple passive.
- 7. The forms must be submitted by Friday. — modal passive; the doer may be omitted.
- 8. The winner was chosen by the judge. — irregular past participle chosen.
- 9. Phones are not allowed during this test. — present simple negative passive; the school is the understood authority, so the unnecessary by phrase can be omitted.
- 10. The classroom was being decorated by the pupils. — past continuous passive.
When comparing your answer, check the meaning and the tense first. The by phrase is often optional, so an answer without the doer can also be correct. In question 9, the shorter passive answer is preferable because the full by the school phrase sounds awkward and adds little value.
A five-minute active–passive routine
- Minute 1: underline the actor, verb and object in three active sentences.
- Minute 2: move the object to the front of each sentence.
- Minute 3: select the correct tense of be and the past participle.
- Minute 4: decide whether the by phrase is worth keeping.
- Minute 5: change one passive sentence back to active and explain the difference in focus.
Frequently asked questions
Does every passive sentence need by?
No. “The classroom was cleaned” is complete when the action and result matter more than the doer. Use a by phrase when naming the actor helps the reader, as in “The painting was restored by a specialist.”
Is passive voice always bad writing?
No. The active is often more direct, but the passive is useful in procedures, reports and situations where a result is more important than an actor. The right choice depends on what your reader needs to know.
What is the easiest way to recognise the passive?
Look for a form of be plus a past participle, then check whether the subject receives the action. Some identical-looking forms can describe a state rather than an event, so the meaning of the full sentence still matters.