Introduction
The correct passive voice of “Who taught you this poem?” is: “By whom were you taught this poem?” This is one of the most searched grammar questions among CBSE and school students because the sentence starts with a question word, which changes the usual active-to-passive conversion pattern most students learn first.
In my own experience helping students with grammar exercises, this exact sentence trips people up for one simple reason: they try to apply the standard “object becomes subject” rule without first handling the question word correctly. This guide breaks the who taught you this poem passive voice conversion into clear steps, so you’ll never get confused by a “who” question again.
Key Takeaways
- The passive voice of “Who taught you this poem?” is “By whom were you taught this poem?”
- In passive voice, the question word “who” always changes to “whom” when it refers to the doer of the action.
- The sentence structure becomes: By + whom + helping verb + object + main verb (past participle) + original object.
- This sentence is in the simple past tense, so the passive helping verb used is “were,” matching the plural subject “you.”
- The same rule applies to any “who” question where “who” is the subject performing the action, not just this one sentence.
Once this pattern clicks, the person who taught you this poem’s passive voice question stops being a one-off answer to memorize and becomes a rule you can apply to dozens of similar sentences.
What Is Passive Voice? A Quick Refresher
Passive voice shifts the focus of a sentence from the person doing the action to the person or thing receiving it. In an active voice, the subject performs the action directly, as in “The teacher taught the poem.” In passive voice, the object of that action becomes the new subject, and the original subject either moves to the end of the sentence after “by,” or is dropped entirely if it isn’t important.
This distinction matters because English grammar exams frequently test whether students can correctly identify the subject, verb, and object in a sentence before rearranging them. Getting this wrong usually isn’t about not knowing the rule it’s about misidentifying which word is actually the object.
Active Voice vs Passive Voice at a Glance
| Active The teacher taught the poem. | Passive The poem was taught by the teacher. |
As the example above shows, the object (“the poem”) moves to the front and becomes the new subject, while the original subject (“the teacher”) moves after “by.” The verb also changes to a passive form using a helping verb plus the past participle.
Who Taught You This Poem Passive Voice
Now, here’s why this particular sentence behaves differently from the simple example above. The original sentence, “Who taught you this poem?”, is a question, and “who” is the subject doing the teaching. Because “who” is asking about an unknown subject, it must convert to “whom” when it moves to the object position after “by” in the passive version.
As a result, the passive form is: “By whom were you taught this poem?” Notice three changes happened at once “who” became “whom,” the object “you” moved to the subject position, and the verb changed from “taught” to “were taught” to match the passive structure in the past tense.
Step-by-Step: How to Convert “Who” Questions Into Passive Voice
1. Identify the subject, verb, and object. In “Who taught you this poem?”, “who” is the subject, “taught” is the verb, and “you” is the object.
2. Move the object to the front. “You” becomes the new subject of the passive sentence.
3. Add the correct passive helping verb. Since the sentence is in simple past tense, use “were” (because “you” can be plural in grammar even when referring to one person).
4. Convert the main verb to its past participle. “Taught” stays as “taught” since it’s already the past participle form of “teach.”
5. Change “who” to “whom” and place it after “by” at the very start of the sentence.
6. Add back any remaining object. “This poem” stays at the end of the sentence, unchanged.
Why “Who” Becomes “By Whom”
A common question students ask is why “who” can’t just stay as “who” in the passive version. The answer is that once “who” moves out of the subject position and becomes the object of the preposition “by,” grammar rules require the objective case form of the pronoun, which is “whom.” This same shift happens with other pronouns too: “he” becomes “him,” and “she” becomes “her” when they move to an object position.
More Solved Examples of Passive Voice Questions
Seeing the pattern repeated across different sentences makes it much easier to remember. Below are a few more “who” questions converted into passive voice, using the same method explained above.
| Active Who wrote this letter? | Passive By whom was this letter written? |
| Active Who broke the window? | Passive By whom was the window broken? |
| Active Who invited you to the party? | Passive By whom were you invited to the party? |
Notice that every single example follows the same structure: “By whom” starts the sentence, the helping verb agrees with the tense and subject, and the main verb switches to its past participle form.
Common Mistakes Students Make With This Rule
The most frequent mistake is forgetting to change “who” to “whom,” writing “By whom were you taught this poem?” instead of the grammatically correct “By whom.” Another common error is using the wrong helping verb. Some students write “was taught” instead of “were taught,” forgetting that “you” takes a plural verb form even when it refers to a single person.
A third mistake is dropping the word “by” entirely and writing “Whom were you taught this poem?”, which is incomplete. In passive voice, the doer of the action, when included, must always be introduced with “by.” Practicing a handful of examples out loud, as shown above, is usually enough to make these mistakes disappear.
People Also Ask About Passive Voice Questions
A few related questions come up constantly in searches and classroom doubts, so here are quick answers to the most common ones.
• Can “who” ever stay as “who” in a passive voice? No, when “who” refers to the doer of the action and moves to the object position, it must become “whom.”
• Does every passive sentence need “by”? No, “by” is only required when the doer of the action is mentioned; it can be dropped if the doer is unknown or unimportant.
• Is this rule different for present tense questions? The same “who” to “by whom” rule applies, but the helping verb changes to match the tense, such as “is/are taught” in present tense.
FAQs
Q1: What is the passive voice of “Who taught you this poem?”
The correct passive voice of who taught you this poem is: “By whom were you taught this poem?” This follows the standard rule for converting interrogative sentences that begin with “who,” where the question word changes to “whom” once it becomes the object of the preposition “by” in the passive structure.
Q2: Why does “who” change to “whom” in passive voice?
“Who” changes to “whom” because it moves from the subject position to the object position when the sentence is rewritten in passive voice. Grammar rules require pronouns in the object position to take their objective case form, and “whom” is the objective form of “who,” just as “him” is the objective form of “he.”
Q3: What tense is used in the who taught you this poem passive voice sentence?
The sentence is in simple past tense, since the original active sentence, “Who taught you this poem?”, also uses simple past tense with the verb “taught.” In the passive version, this becomes “were taught,” using the past tense helping verb “were” along with the past participle “taught.”
Q4: Is “By whom were you taught this poem?” also correct?
No, this is a common mistake. In formal written English, “who” must be changed to “whom” whenever it follows a preposition like “by.” While “by who” is sometimes heard in casual spoken English, it is considered grammatically incorrect and would be marked wrong in most school exams and grammar tests.
Q5: How can I practice more passive voice questions like this one?
The best way is to take five or six “who” questions from your textbook, identify the subject, verb, and object in each one, and then apply the same five-step method used for who taught you this poem passive voice: move the object forward, choose the right helping verb, convert the main verb, and change “who” to “whom.” Repetition across different sentences builds the pattern into memory quickly.
Final Thoughts
The person who taught you this poem passive voice question looks tricky at first only because it starts with a question word, but once you break it into the same five steps used for any passive conversion, it becomes just as mechanical as any other sentence. The full answer, “By whom were you taught this poem?”, follows directly from identifying the subject, moving the object, choosing the right helping verb, and converting “who” to “whom.”
The fastest way to make this rule permanent is to practice it on five or six different “who” questions, exactly as shown in the examples above, until the pattern feels automatic rather than something you have to work out each time.
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Jennifer Aston is a passionate poetry curator and writer with a deep love for the written word. She believes poetry has the power to heal, inspire, and connect people across all walks of life. Through PoemSteric, she brings together timeless and modern verses for every emotion and every moment.