PASSIVE AND ACTIVE EQUIVALENTS.

Notice that the tense of the verb to be in the passive voice is the same as the tense of the main verb in the active voice.

Example: to keep
EACH VERB TENSE IS FOLLOWED BY ACTIVE VOICE FORM AND THEN PASSIVE VOICE FORM.

• Simple present keep(s) - am/is/are kept
• Present continuous is keeping - am/is/are being kept
• Simple past kept - was/were kept
• Past continuous was keeping - was/were being kept
• Present perfect have kept -have/has been kept
• Past perfect had kept - had been kept
• Simple future will keep - will be kept
• Going to-future is going to keep - am/is/are going to be kept
• Modals: can keep -can be kept // should keep - should be kept //could keep - could be kept

Some example sentences with other verbs:
Active: I had told the students to study hard but...
Passive: The students had been told to study hard but...
Active: My 3rd year students have understood the passive at last!!!!!!!!
Passive: The passive has been understood by my 3rd year students at last!!!!!!!!!
Active: They are repairing the road.
Passive: The road is being repaired.
Active: Shakespeare wrote Hamlet and Macbeth.
Passive: Hamlet and Macbeth were written by Shakespeare.
Active: I was telling an interesting story to the students when someone interrupted!!
Passive: The students were being told an interesting story when someone interrupted!!
Active: Students can remember topics easily when they're relevant for them.
Passive: Topics can be easily remembered by students when they are relevant for them.

N.B. :ADAPTED FROM A WEBSITE BUT MOST EXAMPLE SENTENCES MADE BY THIS TEACHER!!!!!!!!!!!!!!!!!!!!!!!!!!!