The sentence that uses the passive voice is: The tree was planted by Mary.

What is passive voice example?

A verb is in the passive voice when the subject of the sentence is acted on by the verb. For example, in “The ball was thrown by the pitcher,” the ball (the subject) receives the action of the verb, and was thrown is in the passive voice.

What words are used in passive voice?

Any form of the word "to be." The words "am," "is," "are," "was," "were," "be," "being," and "been" come before the verb in passive voice form. The "-en" form of the verb. An "-en" verb form is an indication of passive construction. Some verbs do not take an "-en" ending and use "-ed" instead.