Final answer:
To rewrite the active sentence 'She had told us the news before' in the passive voice, it becomes 'The news had been told to us by her before.' The subject 'the news' is acted upon, 'had been' is the form of 'to be', and 'told' is the past participle.
Step-by-step explanation:
To rewrite the active sentence 'She had told us the news before' into the passive voice, we must make sure the subject is the entity being acted upon, use the appropriate form of the verb 'to be' for the tense, and possibly include a 'by [noun phrase]' if the doer of the action is to be mentioned. Since the original sentence is in the past perfect tense, we maintain this tense in the passive construction.
The converted sentence in the passive voice would be: 'The news had been told to us by her before.' In this structure, 'the news' becomes the subject receiving the action, 'had been' is the correct form of 'to be', and 'told' is the past participle of 'tell'. Additionally, 'by her' indicates who performed the action, although this part can be omitted if the doer is not necessary for the context: 'The news had been told to us before.'
When converting sentences to the passive voice, it is essential to recognize the original tense and ensure that the conversion maintains this tense. For example, in the past perfect tense, 'had told' becomes 'had been told', which preserves the timing of the action relative to other events.