Answer:
In the passive voice, the sentence becomes:
Our tree-planting project to preserve the environment had been appreciated by the city.
Step-by-step explanation:
To transform a sentence from the active to the passive voice, we must identify mainly three elements: the subject, the verb, and the direct object. The direct object will become the subject in the passive sentence, and the old subject will become the agent, preceded by the preposition "by". The verb tense is maintained, but the auxiliary "be" is added, respecting the tense. In the sentence we are analyzing here, we have:
- The city → subject
- had appreciated → verb (past perfect)
- our tree-planting project to preserve the environment → direct object
After following the steps mentioned above, we have:
- Our tree-planting project to preserve the environment → new subject
- had been appreciated → verb (past perfect)
- by the city → agent
Thus:
Our tree-planting project to preserve the environment had been appreciated by the city.