Passive Voice Formula for request: You are requested + to + V1+ object.
Given sentence is in simple present tense and it is in active voice.
Rule:
Subject + (is/am/are) + V3 + Other agents
Active voice formula:
Subject + Verb + Object
Passive Voice Formula:
Object + (Be+ V3)+ (By+ subject)
Past Perfect Tense
Active Voice Formula: Subject + had + V3+ object.
Passive Voice Formula: Object + had+ been + V3 + (By + subject)
ADVISE/SUGGESTION
Active Voice Formula: V1 + object.
Passive Voice Formula: subject + should + be + v3.
Active: Take action against the thief.
Passive: Action should be taken against the thief.