Who is the author?

when was the document written?

who is the intended audience?

what is the purpose of the document?

what is the historical context in which the document was written (i. e., what is happening historically at the time the author wrote the document)?

what biases are detectable in the document?

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.

i'm thinking it would be when compound subjects are joined by or, nor,either-or, neither-nor.