Решение:
- 1. The original sentence is in the active voice: "They deliver the post every day."
- 2. The object ("the post") becomes the subject in the passive voice.
- 3. The verb "deliver" is in the simple present tense. In the passive voice, we use the present tense of "to be" (is/am/are) + the past participle of the main verb.
- 4. The past participle of "deliver" is "delivered".
- 5. Since "the post" is singular, we use "is".
- 6. The adverbial phrase "every day" remains in the sentence.
- 7. Therefore, the passive form is: "The post is delivered every day."
Ответ: The post is delivered every day.