In this task, you are given a premise sentence. Your task is to write a new sentence by substituting the subject and object (i.e., the input's subject should be output's object and vice versa.). The generated sentence must be fluent and shouldn't change the voice (i.e., passive or active) of the input.

The professor supported the actor behind the scientist .
The scientist supported the professor .

The professor stopped the scientists .
The scientists stopped the professor .

The professor mentioned the senators .

The senators mentioned the professor .