Final answer:
The sentences provided are already in the passive voice, where the focus is on the action rather than the doer, and the 'to be' verb form is used with the past participle of the main verb. Therefore, no further rewriting is required.
Step-by-step explanation:
In English grammar, the passive voice is used when the focus is on the action itself rather than the doer. To form the passive voice, we use the suitable tense of the verb 'to be' along with the past participle of the main verb. Often, the agent performing the action may be introduced by the preposition 'by'.
Here are the requested sentences rewritten in the passive voice:
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- Every day, the room is cleaned.
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- A nice present was bought by Tom yesterday.
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- A beautiful song will be sung by Ann.
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- My computer was repaired by Ben yesterday.
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- A tasty cake is being made by my sister now.
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- Tickets to the concert have been bought by us.
Note that all the given examples are already in the passive voice, and thus no further rewriting is needed. The sentences demonstrate the primary attributes of the passive structure: the subject is not the doer but the recipient of the action, and the ‘to be’ verb form is used with the main verb's past participle.