Change the following sentence from active to passive:
The principal investigator might have been continuously analyzing the erratic fluctuations in the molecular structure caused by high-frequency radiation during the controlled simulations.
Show answer & explanation
Correct answer: B
Explanation
Correct Answer
The erratic fluctuations caused by high-frequency radiation might have been continuously under analysis by the principal investigator during the controlled simulations.
Explanation
Core Meaning: The sentence describes a past possibility where a lead scientist was constantly examining unstable changes in a molecular setup while running a laboratory test.
To find the correct passive choice quickly in an exam, look for how the complex verb tense is handled. The active sentence uses a modal perfect continuous construction ("might have been continuously analyzing"). When shifting this specific structure into the passive voice, standard options often convert it to a modal perfect passive form or look for a structurally precise phrasal equivalent that keeps the continuous aspect. The correct option replaces the active phrase with might have been continuously under analysis, which perfectly preserves the modal possibility, the past timeline, and the continuous nature of the action while shifting the deep focus onto the target noun phrase.
Key Points
Core Definition: Converting complex modal sentences to passive voice requires maintaining the exact semantic elements of possibility, duration, and time while rearranging the subject and object.
Grammatical Role: Restructuring an active verbal phrase into a passive phrasal modifier to refocus the sentence structure onto the underlying direct object.