Answer: The cat was ran over by the yellow car.
Step-by-step explanation:
When we use passive voice, we place focus on an object/person that experiences an action, instead of the object/person that performs the action (as in active voice). The object in the active sentence thus becomes the subject in the passive sentence.
The yellow car ran over the cat.
The cat was ran over by the yellow car.
As evident in this example, a passive construction consists of verb to be (was) + past participle (ran).