The given sentence is in active voice and it is in Present Perfect Tense.
Rule : Subject + (has /have) + been + V3 + Other agents.
In a passive voice sentence, the subject is not always required, as the focus is on the action and the object.
For example, "The cake was eaten" (no subject mentioned).
The given sentence is in Past Indefinite Tense.
Active voice structure: Subject + past tense form of the verb + object (Her results of final year examination surprised the teachers)
Passive voice structure: Object of the active sentence + was/were + past participle form of the verb + by + subject of the active sentence
(The teachers were surprised at his result of final year examination)
In passive voice, the auxiliary verb "is/are" in the present continuous tense is changed to "was/were" in the past continuous tense.
The main verb remains in the past participle form.
For example:
Active: "The book is being read by the students."
Passive (Past Continuous): "The book was being read by the students."
Active Voice Passive Voice (Auxiliary Verb – is/am/are)
Subject + V1+s/es+ object Object+ is/am/are+ V3+ by + subject
Subject + Do/does+ not + V1 + Object Object + is/am/are+ not + V3+ by Subject
Does+ Subject+ V1+Object+? Is/am/are + Object+ V3+ by subject +?
Sentence having an order.
Active Voice: First form of verb + Object
Passive Voice: You + are + ordered + to + first form of verb + object.
This is a sentence of Present Continuous Tense
The structure for the present continuous passive is: subject + is/are + being + the past participle.
Active Voice: The cat chased the rat.
(Subject = cat, verb = chased, object = rat)
Passive Voice: The rat was chased by the cat.
(Object becomes subject, verb changes to passive form)