Answer:
Usually (but not always), passive voice can include the actor, usually following the verb. ... Yes, this makes sense; therefore, it is a passive voice sentence. To make this sentence active, you will need to put the noun doing the action in the subject location of the sentence.
Step-by-step explanation:
resent Infinitive to keep to be kept
Perfect Infinitive to have kept to have been kept
Present Participle & Gerund keeping being kept
Perfect Participle having kept having been kept
(happy to help)