Change the following from active to passive:
The engineer is testing the system to ensure its reliability under stress.
Show answer & explanation
Correct answer: B
Explanation
Correct Answer
The system is being tested by the engineer to ensure its reliability under stress.
Explanation
The original active voice sentence uses the present continuous tense (is testing). When converting a present continuous active sentence into the passive voice, the structural rule dictates using is/am/are + being + past participle (V3). The singular object "the system" shifts to the subject position, which matches with the singular auxiliary is being tested. The infinitive phrase "to ensure its reliability under stress" remains unchanged at the end of the clause, and the original active subject is accurately introduced using the agentive phrase "by the engineer."
Key Points
Word: Is being tested
Meaning: The passive voice transformation of the present continuous active verb 'is testing'.
Grammatical Role: Passive verb phrase (functions to show that the action is continuously being received by the grammatical subject).