Choose the correct passive voice transformation of the sentence:
What are they building?
Show answer & explanation
Correct answer: B
Explanation
The original sentence 'What are they building?' is in the present continuous tense (active voice).
To transform it into the passive voice, the tense must remain the same.
The structure for the present continuous passive voice is 'is/are/am + being + past participle (built)'.
Option B follows this rule.