Select the correct active form of the given sentence.

Have all the bills been verified by someone?

Has someone verified all the bills?

The correct active form of the given sentence is Has someone verified all the bills?

The passive voice is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "all the bills" and the main verb is "verify." The past participle of "verify" is "verified." So, the passive form of the sentence is "Have all the bills been verified by someone?"

The active voice is formed by putting the subject of the passive sentence before the verb and the past participle of the main verb. In this case, the subject of the passive sentence is "someone" and the main verb is "verify." The past participle of "verify" is "verified." So, the active form of the sentence is Has someone verified all the bills?

The other options are incorrect because:

• Has someone verify all the bills? is grammatically incorrect. The verb "to verify" is followed by a direct object, but the phrase "has someone verify" is not a direct object.
• Is someone verifying all the bills? is in the present progressive tense, while the original sentence is in the present perfect tense.
• Have someone verified all the bills? is grammatically incorrect. The verb "to have" is followed by a past participle, but the phrase "have someone verified" is not a past participle.