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 secretaries that the judges believed encouraged the doctor .
The doctor encouraged the secretaries .

The professor that the lawyers thanked introduced the presidents .
The lawyers introduced the professor .

The students recognized the senator .

The senator recognized the students .