Final answer:
To convert the verbs to passive form, 'are delivered' is used for a recurring present action and 'was found' for a past completed action.
Step-by-step explanation:
The passive form of verbs is frequently used when the focus is on the action rather than the subject. In the exercise presented, we are asked to complete sentences with the passive form of the verbs provided. When constructing a passive sentence, ensure that the subject of the sentence receives the action of the verb. This often involves auxiliaries like am, is, are, was, or were, depending upon the tense.
Examples:
- Letters are delivered by the postman at 8 every day. (present passive)
- This bag was found on the bus yesterday. (past passive)
By using the passive voice, the sentences emphasize the action and de-emphasize the doer of the action.