The sentence "The students have written the test" is in the active voice. To change it into the passive voice, we need to identify the subject, verb, and object.
* Subject: The students
* Verb: have written
* Object: the test
To convert to passive voice, we make the object the subject, and the subject the object (often introduced by "by"). The verb changes to a form of "to be" + past participle of the verb.
Since the original sentence is in the present perfect tense, the passive form will also be in the present perfect tense. The structure is:
Object + have/has been + past participle + (by subject)
In this case, it becomes:
"The test has been written by the students."
**Ответ:** The test has been written by the students.
**Перевод:** Тест был написан студентами.