Решение:
- 1. The original sentence is in the negative active voice: "Ben didn't steal Johnny's bag."
- 2. The object ("Johnny's bag") becomes the subject in the passive voice.
- 3. The verb "steal" is in the simple past tense. The negative passive form uses "was/were not" + past participle.
- 4. The past participle of "steal" is "stolen".
- 5. Since "Johnny's bag" is singular, we use "was not" (or "wasn't").
- 6. The agent "by Ben" can be added.
- 7. Therefore, the passive form is: "Johnny's bag wasn't stolen by Ben."
Ответ: Johnny's bag wasn't stolen by Ben.