Решение:
- 1. The original sentence is in the active voice: "They built the school in 1956."
- 2. The object ("the school") becomes the subject in the passive voice.
- 3. The verb "built" is in the simple past tense. In the passive voice, we use the past tense of "to be" (was/were) + the past participle of the main verb.
- 4. The past participle of "build" is "built".
- 5. Since "the school" is singular, we use "was".
- 6. The year "in 1956" remains in the sentence.
- 7. The agent "by them" is usually omitted when it's indefinite or obvious.
- 8. Therefore, the passive form is: "The school was built in 1956."
Ответ: The school was built in 1956.