Determine the verb (what is acted upon the subject) in the active voice, then change the verb to the form: be + past participle of the verb.
(be-verbs: is, are, am; was, were)
Examples in different tenses of the verb:
Simple Present Tense
Active: Mary washes the dishes everyday.
Passive: The dishes is washed by May everyday.
Active: Mary is washing the dishes.
Passive: The dishes is being washed by Mary.
Active: Mary washed the dishes.
Passive: The dishes were washed by Mary.
Active: Mary was washing the dishes when her friend called.
Passive: The dishes was being washed by Mary when her friend called.
Active: Mary has washed those dishes in the cabinet.
Passive: Those dishes in the cabinet have been washed by Mary.
Present Perfect Continuous:
Active: Recently, May has been doing the research work.
Passive: Recently, the research work has been being done by Mary.
Active: Mary had done the research work recently.
Passive: Recently, the research work had been done by Mary.
Past Perfect Continuous:
Active: Mary had been preparing the research work for two months before she moved to Manila.
Passive: The research work had been being prepared by Mary for two months before she moved to Manila.
Use the above examples as guide to changing active to passive voice in Simple and Perfect Future Tenses.