2 Passive voice is not a TENSE (Simple Present, Present Perfect, Future). It always uses the verb TO BE and the PAST PARTICIPLE of a verb, but thisdoesn‘t mean the sentence is in PAST.Your voice is amplified by the microphone.VERB TO BEPAST PARTICIPLE
3 The verb TO BE determines the tense of a sentence. ACTIVEPASSIVEThe security sensors detect movement.Movement is detected by the security sensorsThe verb “detect” is inSimple PresentThe verb “TO BE” is inSimple Present
4 ACTIVEPASSIVEA virus attacked the system.The system was attacked by the virus.The verb “attack” is inSimple PastThe verb “TO BE” is inSimple Past.ACTIVEPASSIVEScientists have studied the case for years.The case has been studied for years.The verb “study” is inPresent Perfect.The verb “TO BE” is inPresent Perfect.
5 ACTIVEPASSIVEPeople are learning TIC’s.TIC’s are being learned.The verb “learn” is inPresent ProgressiveThe verb “TO BE” is inPresent Progressive.ACTIVEPASSIVEPeople were drinking Coke in the 1980’s.Coke was being drunk in the 1980’s.The verb “drink” is inPast Progressive.The verb “TO BE” is inPast Progressive.
6 ACTIVEPASSIVEPeople have been using other energy sources.Other energy sources have been being used.The verb “use” is inPresent Perfect Progressive.The verb “TO BE” is inPresent Perfect Progressive.ACTIVEPASSIVEPeople will discover life forms in the space.Life forms will be discovered in space.The verb “discover” is inFuture with will.The verb “TO BE” is inPresent Perfect Progressive.
7 Notice that the main verb of all the examples above is in PAST PARTICIPLE. The verb TO BE is the one that changes.Movement is detected by the security sensorsThe system was attacked by the virus.The case has been studied for years.TIC’s are being learned.Coke was being drunk in the 1980’s.Other energy sources have been being used.Life forms will be discovered in space.