I can understand why the author uses them all right.

Some authors use different words to mean the same thing.

Like regular people, these authors used to have a 9 to 5.

This is also the final novel where the author used his middle name on the cover and title page.

By his own account, the author used about 50,000 butterflies for the project.

I wonder whether the author has ever actually used a search engine?

The author uses the third person, as if to stress the remove.

Other authors use different language when describing the same thing.

In addition, for some variables, the authors used common sense.

The author uses a child to make the message of the book stronger.