In john steinbeck’s “the turtle,” what happens to the red ant that slips inside the turtle’s shell?

The turtle withdrew its head and legs into its shell.  As it did that, the red ant that crawled inside its shell was crushed.  After doing that, the turtle put out its head and legs and continued its journey to the road.

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.