The simple past passive voice is an important English grammar structure used to emphasize the person or thing affected by an action that happened in the past. It frequently appears in grammar exercises, English tests, academic writing, and everyday communication.
To use the simple past passive voice correctly, learners need to understand how to form was and were, use past participles, and transform active sentences into passive ones. This guide explains the formulas, sentence structures, usage rules, common mistakes, and practice exercises with answers to help you master this grammar point.
Understanding the Simple Past Passive Voice
Before learning the simple past passive voice formula, it is helpful to understand what passive voice is and how the simple past tense works.
What Is the Simple Past Passive Voice?
The passive voice is used when the speaker wants to focus on the person or thing receiving an action rather than the person performing it.
Compare these sentences:
- Active voice: Tom broke the window.
- Passive voice: The window was broken by Tom.
In the active sentence, Tom is the subject performing the action, while the window is the object receiving it. In the passive sentence, the window becomes the new subject, placing greater emphasis on the affected object.
The general passive voice formula is:
Subject + be + past participle + (by + agent)
The main components are:
- Subject: The person or thing receiving the action.
- Be: A form of the verb be, which changes according to the tense and subject.
- Past participle: The third form of the main verb, also called V3. Regular verbs usually end in -ed, while irregular verbs have different forms.
- By + agent: An optional phrase identifying the person or thing performing the action.
When the passive voice is used in the simple past tense, be changes to was or were.
What Is the Simple Past Tense?
The simple past tense describes actions or events that happened and finished at a specific time in the past.
For example:
They cleaned the room yesterday.
The verb cleaned indicates that the action took place in the past.
Common time expressions used with the simple past include:
- Yesterday
- Last night, last week, last year
- Two days ago, three months ago
- In 2019, in 2022
When converting an active sentence into the passive voice, the original past-time meaning remains unchanged. However, the verb structure changes to reflect the passive construction.
Simple Past Passive Voice Formula and Sentence Structure
The simple past passive voice formula consists of was/were followed by the past participle of the main verb. The structure changes depending on whether the sentence is affirmative, negative, or interrogative.
Affirmative Simple Past Passive Voice Formula
The affirmative structure is:
Subject + was/were + past participle + (by + agent)
Use was with I, he, she, it and singular nouns. Use were with you, we, they and plural nouns.
Examples:
- The letter was sent yesterday.
- The windows were cleaned last Sunday.
- The cake was made by my mother.
In these sentences, was sent, were cleaned, and was made are passive verb phrases in the simple past tense.
Remember that the main verb must be in its past participle form. Do not use the base form or the simple past form when the two forms are different.
Negative Simple Past Passive Voice Formula
To make a negative sentence, place not after was or were.
The formula is:
Subject + was/were + not + past participle + (by + agent)
Examples:
- The door was not locked last night.
- The documents were not signed yesterday.
- The package wasn’t delivered on Monday.
In everyday English, contractions are common:
- Was not → wasn’t
- Were not → weren’t
Both the full and contracted forms are grammatically correct. The full forms may be more suitable for formal writing, while contractions are common in informal communication.
Interrogative Simple Past Passive Voice Formula
To form a yes/no question, place was or were before the subject.
The formula is:
Was/Were + subject + past participle + (by + agent)?
Examples:
- Was the house built in 1990?
- Were the invitations sent yesterday?
- Was the report completed by Anna?
Short answers follow the same subject and auxiliary verb agreement:
- Yes, it was. / No, it wasn’t.
- Yes, they were. / No, they weren’t.
For questions beginning with a question word, use this structure:
Wh-word + was/were + subject + past participle + (by + agent)?
Example:
When was this building constructed?
This question asks about the time when the building was constructed.
Was or Were in the Simple Past Passive Voice?
Choosing between was and were is essential when applying the simple past passive sentence structure. The choice depends on the new subject of the passive sentence.
| Subject | Correct form |
| I, he, she, it | was |
| Singular nouns | was |
| You, we, they | were |
| Plural nouns | were |
Examples:
- The car was repaired yesterday.
- The cars were repaired yesterday.
In the first sentence, car is singular, so was is required. In the second sentence, cars is plural, so were is correct.
Quick tip: After moving the object to the beginning of the passive sentence, identify whether the new subject is singular or plural before choosing was or were.
How to Change Active Sentences into the Simple Past Passive Voice
Transforming active sentences into passive sentences becomes easier when you follow a clear process. The following steps work for typical active sentences that contain a direct object and a transitive verb.
Step 1: Identify the Subject, Verb, and Object
First, determine who performs the action, what the action is, and which person or thing receives it.
Example:
The students cleaned the classroom.
- Subject: The students
- Verb: cleaned
- Object: the classroom
Identifying these sentence elements helps you determine which part should become the new subject.
Step 2: Move the Object to the Beginning
The object of the active sentence becomes the subject of the passive sentence.
In the example above, the classroom moves to the beginning:
The classroom …
Step 3: Add Was/Were and the Past Participle
Because the classroom is singular, use was. The verb clean has the same simple past and past participle form: cleaned.
The sentence now becomes:
The classroom was cleaned …
Step 4: Add By + Agent When Necessary
If the person performing the action is important, add by followed by the agent.
The complete sentence is:
The classroom was cleaned by the students.
However, the agent does not always need to be mentioned. If the person responsible is unknown, obvious, or unimportant, you can leave out the by-phrase.
For example:
Someone stole my bike last night.
The passive version is:
My bike was stolen last night.
Here, my bike becomes the new subject, and stole changes to its past participle form, stolen. The phrase by someone is unnecessary because the person responsible is unknown and not the focus of the sentence.
When Should You Use By in the Simple Past Passive Voice?
In the simple past passive voice, the phrase by + agent identifies the person or thing responsible for an action. Include it when this information is relevant to the meaning of the sentence.
For example:
The Mona Lisa was painted by Leonardo da Vinci.
The artist’s identity is important, so the by-phrase provides useful information.
In contrast, you can omit the agent when it is unknown, unimportant, or clear from the context.
Example:
My wallet was stolen yesterday.
The sentence communicates the essential information without identifying the person who stole the wallet. Adding by someone would usually be unnecessary.
The passive voice is also common in news reports, official announcements, scientific writing, and academic texts. In these contexts, the writer may want to emphasize an event, process, or result rather than the person performing the action.
Common Simple Past Passive Voice Mistakes
Learners often make mistakes when applying the simple past passive voice formula, particularly when choosing was/were, using past participles, or arranging sentence elements.
Using Was Instead of Were
Incorrect:
The books was sold yesterday.
Correct:
The books were sold yesterday.
Explanation: The books is plural, so the sentence requires were, not was.
Using the Simple Past Form Instead of the Past Participle
Incorrect:
The letter was wrote yesterday.
Correct:
The letter was written yesterday.
Explanation: The verb write has three forms: write – wrote – written. The passive construction requires the past participle written.
Keeping the Original Active Sentence Structure
Incorrect:
The students were cleaned the classroom.
Correct:
The classroom was cleaned by the students.
Explanation: The object the classroom must become the subject of the passive sentence. Simply adding was or were to an active sentence does not create a correct passive construction.
Using By When It Is Unnecessary
Less natural in an ordinary context:
My phone was stolen by someone yesterday.
More natural:
My phone was stolen yesterday.
Explanation: If the agent is unknown or irrelevant, omitting by someone makes the sentence more concise.
Trying to Make Every Verb Passive
Not every active sentence can be transformed into the passive voice using the basic structure. A typical passive construction requires a direct object that can become the new subject.
Intransitive verbs such as arrive, sleep, and happen generally cannot be used in this basic passive pattern.
For example:
The accident happened yesterday.
Do not write:
The accident was happened yesterday.
The verb happen does not take a direct object in this sentence, so the standard passive construction is not appropriate.
Simple Past Passive Voice Exercises with Answers
After learning the formulas and transformation steps, practise with the following simple past passive voice exercises to check your understanding.
Exercise 1: Change Active Sentences into the Passive Voice
Rewrite each sentence using the simple past passive voice without changing its meaning.
- They built this bridge in 2015.
- Someone broke the window last night.
- The teacher checked our homework yesterday.
- They cleaned the streets last Sunday.
- Shakespeare wrote this play.
Exercise 2: Complete the Sentences with the Correct Verb Forms
Fill in each blank with the correct simple past passive form of the verb in brackets.
- The house __________ (build) ten years ago.
- These books __________ (sell) last month.
- My phone __________ (steal) yesterday.
- The letters __________ (send) two days ago.
- The classroom __________ (clean) after the lesson.
Exercise 3: Choose the Correct Answer
Select the correct option to complete each sentence.
- The documents ______ yesterday.
- A. was signed
- B. were signed
- C. were sign
- The cake ______ by my sister last night.
- A. was made
- B. were made
- C. was make
- ______ the invitations sent last week?
- A. Did
- B. Was
- C. Were
- The old building ______ in 2005.
- A. was constructed
- B. were constructed
- C. was construct
- The emails ______ not delivered yesterday.
- A. was
- B. were
- C. did
Answer Key and Explanations
Exercise 1:
- This bridge was built in 2015.
- The window was broken last night.
- Our homework was checked by the teacher yesterday.
- The streets were cleaned last Sunday.
- This play was written by Shakespeare.
Exercise 2:
- was built
- were sold
- was stolen
- were sent
- was cleaned
Exercise 3:
- B. were signed
- A. was made
- C. Were
- A. was constructed
- B. were
When checking your answers, focus on three important details: whether the new subject agrees with was/were, whether the main verb is in the past participle form, and whether the sentence follows the correct passive word order.
For irregular verbs, reviewing the V1–V2–V3 forms can help you avoid common mistakes.
Quick Review of the Simple Past Passive Voice Formula
To use the simple past passive voice correctly, remember these essential rules:
- Affirmative: Subject + was/were + past participle + (by + agent).
- Negative: Subject + was/were + not + past participle + (by + agent).
- Interrogative: Was/Were + subject + past participle + (by + agent)?
- The object of the active sentence becomes the subject of the passive sentence.
- Use was with singular subjects and I, he, she, and it. Use were with you, we, they, and plural subjects.
- The main verb must be in the past participle form.
- Include by + agent only when identifying the person or thing performing the action is useful.
Regular practice with different sentence types will help you remember the formula, recognize irregular verbs, and transform active sentences into passive sentences more accurately.
Frequently Asked Questions About the Simple Past Passive Voice
Can the Simple Past Passive Voice Be Used with Intransitive Verbs?
Generally, no. An active sentence without a direct object cannot normally be transformed into the passive voice using the basic structure. Intransitive verbs such as arrive, sleep, and happen do not take direct objects in their usual meanings.
For example, They built the house can become The house was built. However, The accident happened yesterday cannot become The accident was happened yesterday.
Does the Simple Past Passive Voice Always Require By + Agent?
No. The by-phrase is optional when the agent is unknown, unimportant, or clear from the context. For example, My bike was stolen last night communicates the main information without specifying who stole the bike.
Include the agent when identifying the person or thing responsible for the action adds important information to the sentence.
How Can You Recognize the Simple Past Passive Voice?
Look for the structure was/were + past participle and check whether the sentence describes an action or event in the past. Contextual time expressions can provide additional clues.
For example, in The car was repaired yesterday, the phrase was repaired is the passive verb phrase, while yesterday indicates the past time.
Why Do Some Passive Sentences Not Include By?
Passive sentences emphasize the person or thing affected by an action rather than necessarily identifying who performed it. When the agent is unknown or irrelevant, omitting the by-phrase keeps the sentence clear and concise.
For example, The classroom was cleaned after the lesson focuses on the result rather than the person who cleaned the classroom.
Which Verbs Are Commonly Confused in the Passive Voice?
Irregular verbs can be challenging because their simple past forms and past participles may differ. Common examples include:
- Write – wrote – written
- Break – broke – broken
- Steal – stole – stolen
- Build – built – built
- Make – made – made
When forming the passive voice, use the third form of the verb after was or were. Reviewing irregular verb lists regularly can help improve accuracy.
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