Who killed the bird? The correct passive form of the sentence is —-.
Who was killed by the bird?
Who was killed the bird?
By whom the bird was killed?
By whom was the bird killed?
Explanation:
Correct Answer is: By whom was the bird killed?

Who was killed by the bird?
Who was killed the bird?
By whom the bird was killed?
By whom was the bird killed?
Correct Answer is: By whom was the bird killed?

I water the plants. The word `water` is used as- Option A: verb , Option B: adverb , Option C: Noun, Option D: Pronoun, correct answer is: verb
Identify the word that can be used as both singular and plural: Option A: wood , Option B: issue , Option C: fish, Option D: light, correct answer is: fish
`He pocketed the money.` In the sentence, the word `pocketed` has been used as a/an . Option A: Noun , Option B: Verb , Option C: adverb, Option D: Preposition, correct answer is: Verb
I have told you twice. Here `Twice` is- Option A: Adverb , Option B: Adjective , Option C: Noun, Option D: Preposition, correct answer is: Adverb
There has been a breakthrough in the treatment of dengue patients. Here `breakthrough` is a/an- Option A: adjective , Option B: verb , Option C: noun, Option D: adverb, correct answer is: noun