Change the following from active to passive: The agency had been monitoring dissent groups covertly for months.
Dissent groups had been monitored covertly by the agency for months.
The active verb "had been monitoring" is in the past perfect continuous. Because a passive past perfect continuous (had been being monitored) is awkward, it is normally expressed with the past perfect passive: had been + past participle.
The object "dissent groups" becomes the subject, the doer goes into a by-phrase, and the adverbs are retained: "Dissent groups had been monitored covertly by the agency for months."
"Dissent groups had covertly monitored the agency" reverses who did the monitoring. "Covert monitoring had occurred over months" and "The dissent groups were under surveillance" are rewordings that drop the agent or the verb structure, not passive transformations.
Hence, the passive form is "Dissent groups had been monitored covertly by the agency for months."
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Important Questions from Active and Passive Voice
Directions: Select the correct passive form of the given sentence.
The coach received the members of the team with great excitement.
Select the correct passive form of the given sentence.
They are laying new telephone cables in our colony.
Select the correct passive form of the given sentence.
Dr. Verma advised patients to try out a new medicine for migraine.
Choose the correct passive construction of the sentence:
Rosy paints beautiful landscapes.
Direction: Select the correct transformation from active to passive voice :
They made him prince.
