The verb is said to be in the active voice when the subject does something. The person or thing denoted by the subject is the doer of the action. The verb is said to be in the passive voice, when the subject is being acted upon. The person or thing denoted by the subject experiences the result of the action done by someone or something.
Change of voice from active to passive depends on the tense of the verb. The passive is formed in this way:
Simple present: Am/is/are + past participle Present continuous: Is/are +being+ past participle
Present perfect: Has/have + been + past participle
Simple past: Was/ were + past participle Past continuous: Was/were + being + past participle
Past perfect: Had + been + past participle
Simple future: Will be + past participle
Future perfect: Will have + been + past participle can/ could/may/must/ should + verb; can be / could be / may be /must be / should be + past participle
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