The dog chases after the car.
The dog chased a car.
The monkey was jumping from one tree to the next.
The banana peels were thrown by the monkey because he got angry.
The dog chases after the car.
The dog chased a car.
The monkey was jumping from one tree to the next.
The banana peels were thrown by the monkey because he got angry.
Sentences where the main verb is a form of “to be” (e.g., is, am, are, was, were, be, being, been, etc.) are neither active nor passive. The third sentence is a “to be” sentence, although I think you intended it to be present passive. “Bananas are eaten by the monkey” is present passive.