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 supported the student who the authors introduced .
The student supported the secretaries .

The scientist stopped the secretary .
The secretary stopped the scientist .

The secretaries introduced the author .

The author introduced the secretaries .