You've located three books on a topic you're researching for an essay. the first thing you should do in determining if any of these books will be useful is
a. examine the index of each book.
b. study the table of contents carefully in each book.
c. inspect each book jacket for notes about the author.
d. browse each book from front to back.

active voice: my father cut the tree.

passive voice: the tree was cut by my father.

active voice: people buy newspapers every day.

passive voice: newspapers are bought (by people) every day.

active voice: people have been using movies as political propaganda since world war ii.

passive voice: movies have been used as political propaganda since world war ii.

active voice: donna gave me my birthday present.

passive voice: i was given my birthday present (by donna). / my birthday present was given to me (by donna).

active voice: mom will leave the keys on the counter.

passive voice: the keys will be left (by mom) on the counter.

the words in parentheses are the agent of the passive voice and can be omitted when obvious, generic, or simply unnecessary.

choices ? or is this a actual question from yourself ?