What is the passive voice of "The cat chased the rat."?

The rat was chased by the cat

The cat is chasing the rat.

The rat is being chased by the cat.

The rat chases the cat.

Active Voice: The cat chased the rat.

(Subject = cat, verb = chased, object = rat)

Passive Voice: The rat was chased by the cat.

(Object becomes subject, verb changes to passive form)