Question

someone has broken the crystal vase ( change in passive voice)

Answer 1

The crystal vase has been broken by someone.
Hope it helps u.

Answer 2

When we change in passive voice sentence will become "the crystal vase has been broken by someone". In both form of sentence meaning is same only structures of words are changed. In active sentence subject is ‘’someone’’ object is ‘’crystal vase’’ and verb is ‘’broken’’. In passive voice object ‘’crystal vase’’ will become subject and subject ‘’someone’’ will become object. In passive voice auxiliary verb ‘’has been’’ will be used tense of verb will be in past participle.