Find out the correct passive from of the sentence ‘Who taught you French?’

1. Original sentence: "Who taught you French?"

- The original sentence is in the active voice, with the subject "who" performing the action of teaching.

2. Formation of passive voice:

- To transform an active sentence into the passive voice, the object of the active sentence becomes the subject of the passive sentence.

- The original subject becomes the agent preceded by "by."

- The verb is changed to the past participle form.

3. Correct passive form: "By whom were you taught French?"

- "You" (the object in the original sentence) becomes the subject in the passive form.

- "Taught" is the past participle of the verb "teach."

- "By whom" is used to introduce the agent.

So, the rule involves rearranging the sentence to place the object of the active sentence as the subject in the passive voice, using the past participle form of the verb, and introducing the agent (if necessary) with "by."