Select the correct active form of the given sentence.
Before locking up, all the lights were switched off by the guard.
Show answer & explanation
Correct answer: C
Explanation
Correct Answer: Before locking up, the guard switched off all the lights.
Explanation
• The given sentence is in the passive voice using the simple past tense (were + past participle: were switched off).
• To change a simple past sentence from passive to active voice, the structure is: Subject + V2 (past tense) + Object.
• The agent by the guard becomes the grammatical subject (the guard), the passive verb were switched off changes to the active form switched off, and all the lights serves as the object.
• The introductory phrase Before locking up remains positioned at the beginning, followed by a comma.